fix: use ConfigService for DeepSeek base URL in testCredential

- Replace hardcoded 'https://api.deepseek.com/v1/models' with config lookup
- Single source of truth via ai.deepseek.baseUrl (DEEPSEEK_BASE_URL env)
- Add ConfigService dep to UserAiService constructor + test mock

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

src/modules/ai-runtime/user-ai.service.spec.ts

@@ -1,4 +1,5 @@
 import { Test, TestingModule } from '@nestjs/testing';
+import { ConfigService } from '@nestjs/config';
 import { BadRequestException, NotFoundException } from '@nestjs/common';
 import { UserAiService } from './user-ai.service';
 import { PrismaService } from '../../infrastructure/database/prisma.service';
@@ -42,6 +43,7 @@ describe('UserAiService.createAnalysisJob', () => {
         { provide: PriorityRulesService, useValue: priorityRules },
         { provide: UserAiQuotaService, useValue: quota },
         { provide: PlatformBudgetService, useValue: budget },
+        { provide: ConfigService, useValue: { get: jest.fn().mockReturnValue('https://api.deepseek.com') } },
       ],
     }).compile();
 

src/modules/ai-runtime/user-ai.service.ts

@@ -1,4 +1,5 @@
 import { Injectable, NotFoundException, BadRequestException } from '@nestjs/common';
+import { ConfigService } from '@nestjs/config';
 import { PrismaService } from '../../infrastructure/database/prisma.service';
 import { CredentialEncryptionService } from './credential-encryption.service';
 import { SnapshotBuilderService } from './snapshot-builder.service';
@@ -24,6 +25,7 @@ export class UserAiService {
     private readonly priorityRules: PriorityRulesService,
     private readonly quota: UserAiQuotaService,
     private readonly budget: PlatformBudgetService,
+    private readonly config: ConfigService,
   ) {}
 
   // ══ LearningProfile ══
@@ -143,7 +145,8 @@ export class UserAiService {
     }
 
     try {
-      const res = await fetch('https://api.deepseek.com/v1/models', {
+      const baseUrl = this.config.get<string>('ai.deepseek.baseUrl', 'https://api.deepseek.com');
+      const res = await fetch(`${baseUrl}/v1/models`, {
         headers: { Authorization: `Bearer ${decryptedKey}` },
         signal: AbortSignal.timeout(10000),
       });