feat: AI Runtime Prisma Schema (API-AI-004~010 + 070/071/075)

新增 18 个模型：
- P0: UserLearningProfile, UserAiSettings, UserModelCredential
- P0: AiRuntimeJob, AiRuntimeResult, LearningAnalysisSnapshot
- P0: ModelInvocationLog, UserAiUsageDaily, PlatformAiBudgetDaily
- P0: RuntimeInstance
- P1 预留: AiLearningAnalysis, WeakPointCandidate,
  NextActionRecommendation, QuestionGenerationPlan,
  FlashcardGenerationPlan, Flashcard, AiArtifactFeedback

User 模型补充新表 relation 字段。

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

prisma/schema.prisma

@@ -56,6 +56,12 @@ model User {
   readingEvents           ReadingEvent[]
   materialReadingProgresses MaterialReadingProgress[]
   temporaryReadingMaterials TemporaryReadingMaterial[]
+  learningProfile         UserLearningProfile?
+  aiSettings              UserAiSettings?
+  modelCredentials        UserModelCredential[]
+  aiRuntimeJobs           AiRuntimeJob[]
+  aiRuntimeResults        AiRuntimeResult[]
+  aiAnalysisResultsNew    AiLearningAnalysis[]
 
   @@index([email])
   @@index([status])
@@ -1763,3 +1769,414 @@ model QuizAnswer {
   @@index([attemptId])
   @@index([questionId])
 }
+
+// ═══════════════════════════════════════════════════════
+// M-API-AI-RUNTIME: AI Runtime 调度与落库
+// ═══════════════════════════════════════════════════════
+
+// ── API-AI-004: UserLearningProfile ──
+
+model UserLearningProfile {
+  id                    String   @id @default(cuid())
+  userId                String   @unique
+  learningGoal          String?  @db.VarChar(255)
+  currentLevel          String?  @db.VarChar(32)
+  dailyAvailableMinutes Int?
+  qualityPreference     String?  @db.VarChar(32)
+  ageRange              String?  @db.VarChar(32)
+  occupation            String?  @db.VarChar(100)
+  examTarget            String?  @db.VarChar(255)
+  learningDeadline      DateTime?
+  learningStyle         String?  @db.VarChar(100)
+  aiAcceptanceLevel     String?  @db.VarChar(32)
+  digitalSkillLevel     String?  @db.VarChar(32)
+  preferredQuestionTypes Json?
+  preferredLanguage     String?  @db.VarChar(32)
+  createdAt             DateTime @default(now())
+  updatedAt             DateTime @updatedAt
+
+  user User @relation(fields: [userId], references: [id])
+}
+
+// ── API-AI-005: UserAiSettings ──
+
+model UserAiSettings {
+  id                       String   @id @default(cuid())
+  userId                   String   @unique
+  allowAiAnalysis          Boolean  @default(true)
+  allowUseLearningBehavior Boolean  @default(true)
+  allowUseUserProfile      Boolean  @default(true)
+  allowUseDocumentContent  Boolean  @default(false)
+  allowStoreAiAnalysisHistory Boolean @default(true)
+  apiKeyMode               String   @default("platform_key") @db.VarChar(32)
+  defaultCredentialId      String?
+  fallbackToPlatformKey    Boolean  @default(true)
+  maxDailyAiJobs           Int      @default(20)
+  maxDailyTokenBudget      Int      @default(100000)
+  createdAt                DateTime @default(now())
+  updatedAt                DateTime @updatedAt
+
+  user User @relation(fields: [userId], references: [id])
+}
+
+// ── API-AI-006: UserModelCredential ──
+
+model UserModelCredential {
+  id              String    @id @default(cuid())
+  userId          String
+  provider        String    @default("deepseek") @db.VarChar(32)
+  keyAlias        String?   @db.VarChar(100)
+  encryptedApiKey String    @db.Text
+  keyHash         String    @db.VarChar(255)
+  maskedKey       String    @db.VarChar(20)
+  status          String    @default("active") @db.VarChar(32)
+  lastTestedAt    DateTime?
+  lastUsedAt      DateTime?
+  lastErrorCode   String?   @db.VarChar(100)
+  lastErrorMessage String?  @db.Text
+  createdAt       DateTime  @default(now())
+  updatedAt       DateTime  @updatedAt
+  deletedAt       DateTime?
+
+  user User @relation(fields: [userId], references: [id])
+
+  @@index([userId])
+  @@index([keyHash])
+}
+
+// ── API-AI-007: AiRuntimeJob ──
+
+model AiRuntimeJob {
+  id                  String    @id @default(cuid())
+  userId              String
+  jobType             String    @db.VarChar(64)
+  targetType          String    @db.VarChar(32)
+  targetId            String    @db.VarChar(255)
+  snapshotId          String?
+  status              String    @default("pending") @db.VarChar(32)
+  priority            Int       @default(0)
+  idempotencyKey      String?   @unique @db.VarChar(255)
+  apiKeyMode          String    @default("platform_key") @db.VarChar(32)
+  credentialId        String?
+  modelProvider       String    @default("deepseek") @db.VarChar(32)
+  modelName           String    @default("deepseek-chat") @db.VarChar(64)
+  promptVersion       String?   @db.VarChar(100)
+  outputSchemaVersion String?   @db.VarChar(100)
+  attemptNo           Int       @default(0)
+  retriedFromJobId    String?   @db.VarChar(255)
+
+  lockedBy            String?   @db.VarChar(100)
+  lockedAt            DateTime?
+  lockUntil           DateTime?
+
+  startedAt           DateTime?
+  finishedAt          DateTime?
+
+  retryCount          Int       @default(0)
+  maxRetryCount       Int       @default(3)
+  timeoutSeconds      Int       @default(120)
+
+  errorCode           String?   @db.VarChar(100)
+  errorMessage        String?   @db.Text
+
+  createdAt           DateTime  @default(now())
+  updatedAt           DateTime  @updatedAt
+
+  user   User             @relation(fields: [userId], references: [id])
+  result AiRuntimeResult?
+
+  @@index([status])
+  @@index([jobType])
+  @@index([userId])
+  @@index([targetType, targetId])
+  @@index([lockUntil])
+}
+
+// ── API-AI-007: AiRuntimeResult ──
+
+model AiRuntimeResult {
+  id                     String   @id @default(cuid())
+  jobId                  String   @unique
+  userId                 String
+  runtimeInstanceId      String   @db.VarChar(100)
+  status                 String   @db.VarChar(32)
+  attemptNo              Int      @default(0)
+  resultIdempotencyKey   String?  @db.VarChar(255)
+  outputHash             String?  @db.VarChar(255)
+  rawOutput              Json?
+  validatedOutput        Json?
+  schemaVersion          String   @db.VarChar(100)
+  validationErrors       Json?
+  createdAt              DateTime @default(now())
+  updatedAt              DateTime @updatedAt
+
+  user User         @relation(fields: [userId], references: [id])
+  job  AiRuntimeJob @relation(fields: [jobId], references: [id])
+
+  @@index([userId])
+  @@index([jobId])
+  @@index([resultIdempotencyKey])
+}
+
+// ── API-AI-008: LearningAnalysisSnapshot ──
+
+model LearningAnalysisSnapshot {
+  id                      String    @id @default(cuid())
+  userId                  String
+  scopeType               String    @db.VarChar(32)
+  scopeId                 String    @db.VarChar(255)
+  snapshotVersion         String    @db.VarChar(100)
+  sourceDataVersion       String?   @db.VarChar(100)
+  privacyScope            Json?
+  userProfile             Json?
+  aiSettings              Json?
+  deviceContext           Json?
+  learningBehaviorSummary Json?
+  materialProgressSummary Json?
+  contentStructureSummary Json?
+  behaviorSignals         Json?
+  scoreSignals            Json?
+  constraints             Json?
+  allowedModelFields      Json?
+  expiresAt               DateTime?
+  createdAt               DateTime  @default(now())
+  updatedAt               DateTime  @updatedAt
+
+  @@index([userId])
+  @@index([scopeType, scopeId])
+}
+
+// ── API-AI-009: ModelInvocationLog ──
+
+model ModelInvocationLog {
+  id                  String   @id @default(cuid())
+  userId              String
+  jobId               String
+  provider            String   @db.VarChar(32)
+  model               String   @db.VarChar(64)
+  apiKeyMode          String   @db.VarChar(32)
+  credentialId        String?  @db.VarChar(255)
+  promptName          String   @db.VarChar(100)
+  promptVersion       String   @db.VarChar(100)
+  outputSchemaVersion String   @db.VarChar(100)
+  inputTokens         Int      @default(0)
+  outputTokens        Int      @default(0)
+  totalTokens         Int      @default(0)
+  latencyMs           Int      @default(0)
+  costEstimate        Int?
+  success             Boolean  @default(false)
+  errorCode           String?  @db.VarChar(100)
+  errorMessage        String?  @db.Text
+  retryCount          Int      @default(0)
+  runtimeInstanceId   String   @db.VarChar(100)
+  traceId             String?  @db.VarChar(255)
+  correlationId       String?  @db.VarChar(255)
+  createdAt           DateTime @default(now())
+
+  @@index([userId])
+  @@index([jobId])
+  @@index([provider, model])
+  @@index([createdAt])
+}
+
+// ── P0 增补: UserAiUsageDaily (API-AI-070) ──
+
+model UserAiUsageDaily {
+  id           String   @id @default(cuid())
+  userId       String
+  localDate    DateTime
+  apiKeyMode   String   @db.VarChar(32)
+  jobCount     Int      @default(0)
+  inputTokens  Int      @default(0)
+  outputTokens Int      @default(0)
+  totalTokens  Int      @default(0)
+  costEstimate Int      @default(0)
+  createdAt    DateTime @default(now())
+  updatedAt    DateTime @updatedAt
+
+  @@unique([userId, localDate, apiKeyMode])
+  @@index([userId])
+}
+
+// ── P0 增补: PlatformAiBudgetDaily (API-AI-071) ──
+
+model PlatformAiBudgetDaily {
+  id                    String   @id @default(cuid())
+  localDate             DateTime
+  provider              String   @db.VarChar(32)
+  model                 String   @db.VarChar(64)
+  inputTokens           Int      @default(0)
+  outputTokens          Int      @default(0)
+  totalTokens           Int      @default(0)
+  costEstimate          Int      @default(0)
+  jobCount              Int      @default(0)
+  failedCount           Int      @default(0)
+  circuitBreakerStatus  String   @default("closed") @db.VarChar(32)
+  circuitBreakerReason  String?  @db.VarChar(255)
+  createdAt             DateTime @default(now())
+  updatedAt             DateTime @updatedAt
+
+  @@unique([localDate, provider, model])
+}
+
+// ── P0 增补: RuntimeInstance (API-AI-075) ──
+
+model RuntimeInstance {
+  id                 String   @id @default(cuid())
+  runtimeInstanceId  String   @unique @db.VarChar(100)
+  runtimeVersion     String?  @db.VarChar(50)
+  status             String   @default("active") @db.VarChar(32)
+  lastHeartbeatAt    DateTime?
+  capabilities       Json?
+  createdAt          DateTime @default(now())
+  updatedAt          DateTime @updatedAt
+}
+
+// ── P1 预留: AiLearningAnalysis ──
+
+model AiLearningAnalysis {
+  id            String   @id @default(cuid())
+  userId        String
+  jobId         String
+  snapshotId    String?
+  targetType    String   @db.VarChar(32)
+  targetId      String   @db.VarChar(255)
+  learningState String?  @db.VarChar(32)
+  summary       String?  @db.Text
+  riskLevel     String?  @db.VarChar(32)
+  confidence    Float?
+  evidence      Json?
+  nextActionIds Json?
+  promptVersion String?  @db.VarChar(100)
+  schemaVersion String?  @db.VarChar(100)
+  createdAt     DateTime @default(now())
+  updatedAt     DateTime @updatedAt
+
+  @@index([userId])
+  @@index([jobId])
+}
+
+// ── P1 预留: WeakPointCandidate ──
+
+model WeakPointCandidate {
+  id               String   @id @default(cuid())
+  userId           String
+  jobId            String
+  snapshotId       String?
+  targetType       String   @db.VarChar(32)
+  targetId         String   @db.VarChar(255)
+  knowledgePointId String?  @db.VarChar(255)
+  title            String   @db.VarChar(255)
+  reason           String?  @db.Text
+  confidence       Float?
+  evidence         Json?
+  status           String   @default("active") @db.VarChar(32)
+  createdAt        DateTime @default(now())
+  updatedAt        DateTime @updatedAt
+
+  @@index([userId])
+  @@index([jobId])
+}
+
+// ── P1 预留: NextActionRecommendation ──
+
+model NextActionRecommendation {
+  id                String   @id @default(cuid())
+  userId            String
+  jobId             String
+  snapshotId        String?
+  actionType        String   @db.VarChar(32)
+  targetType        String?  @db.VarChar(32)
+  targetId          String?  @db.VarChar(255)
+  title             String   @db.VarChar(255)
+  reason            String?  @db.Text
+  priority          Int      @default(0)
+  estimatedMinutes  Int?
+  deviceSuitability String?  @db.VarChar(32)
+  status            String   @default("active") @db.VarChar(32)
+  createdAt         DateTime @default(now())
+  updatedAt         DateTime @updatedAt
+
+  @@index([userId])
+  @@index([jobId])
+}
+
+// ── P1 预留: QuestionGenerationPlan ──
+
+model QuestionGenerationPlan {
+  id               String   @id @default(cuid())
+  userId           String
+  jobId            String
+  snapshotId       String?
+  targetType       String?  @db.VarChar(32)
+  targetId         String?  @db.VarChar(255)
+  knowledgePointIds Json?
+  questionTypes    Json?
+  difficultyLevel  String?  @db.VarChar(32)
+  count            Int      @default(5)
+  reason           String?  @db.Text
+  status           String   @default("pending") @db.VarChar(32)
+  createdAt        DateTime @default(now())
+  updatedAt        DateTime @updatedAt
+
+  @@index([userId])
+}
+
+// ── P1 预留: FlashcardGenerationPlan ──
+
+model FlashcardGenerationPlan {
+  id               String   @id @default(cuid())
+  userId           String
+  jobId            String
+  snapshotId       String?
+  targetType       String?  @db.VarChar(32)
+  targetId         String?  @db.VarChar(255)
+  knowledgePointIds Json?
+  count            Int      @default(5)
+  difficultyLevel  String?  @db.VarChar(32)
+  reason           String?  @db.Text
+  status           String   @default("pending") @db.VarChar(32)
+  createdAt        DateTime @default(now())
+  updatedAt        DateTime @updatedAt
+
+  @@index([userId])
+}
+
+// ── P1 预留: Flashcard ──
+
+model Flashcard {
+  id               String    @id @default(cuid())
+  userId           String
+  sourceType       String?   @db.VarChar(32)
+  sourceId         String?   @db.VarChar(255)
+  knowledgePointId String?   @db.VarChar(255)
+  front            String    @db.Text
+  back             String    @db.Text
+  hint             String?   @db.Text
+  difficultyLevel  String?   @db.VarChar(32)
+  sourceBlockIds   Json?
+  generatedByJobId String?   @db.VarChar(255)
+  promptVersion    String?   @db.VarChar(100)
+  schemaVersion    String?   @db.VarChar(100)
+  status           String    @default("draft") @db.VarChar(32)
+  createdAt        DateTime  @default(now())
+  updatedAt        DateTime  @updatedAt
+  deletedAt        DateTime?
+
+  @@index([userId])
+}
+
+// ── P1 预留: AiArtifactFeedback ──
+
+model AiArtifactFeedback {
+  id           String   @id @default(cuid())
+  userId       String
+  artifactType String   @db.VarChar(32)
+  artifactId   String   @db.VarChar(255)
+  feedbackType String   @db.VarChar(32)
+  reason       String?  @db.Text
+  createdAt    DateTime @default(now())
+
+  @@index([userId])
+  @@index([artifactType])
+}