fix: simplify AI Gateway controller

src/modules/ai/ai.controller.ts

@@ -1,8 +1,6 @@
 import { Controller, Get, UseGuards } from '@nestjs/common';
 import { ApiTags, ApiBearerAuth, ApiOperation } from '@nestjs/swagger';
 import { ModelRouter } from './model-router';
-import { PromptTemplateService } from './prompts/prompt-template.service';
-import { AiUsageLogService } from './usage/ai-usage-log.service';
 import { AdminAuthGuard } from '../../common/guards/admin-auth.guard';
 import { AdminRolesGuard } from '../../common/guards/admin-roles.guard';
 import { AdminRoles } from '../../common/decorators/admin-roles.decorator';
@@ -13,27 +11,21 @@ import type { AdminRole } from '../../common/types/admin-role.enum';
 @UseGuards(AdminAuthGuard, AdminRolesGuard)
 @ApiBearerAuth()
 export class AdminAiGatewayController {
-  constructor(
-    private readonly router: ModelRouter,
-    private readonly prompts: PromptTemplateService,
-    private readonly usage: AiUsageLogService,
-  ) {}
+  constructor(private readonly router: ModelRouter) {}
 
   @Get('status')
   @AdminRoles('SUPER_ADMIN' as AdminRole)
   @ApiOperation({ summary: 'AI Gateway 状态' })
   async status() {
     return {
-      providers: ['deepseek', 'minimax'],
-      tiers: this.router['tiers'],
-      prompts: this.prompts.list?.() || [],
+      providers: ['deepseek', 'minimax', 'siliconflow'],
+      tiers: {
+        cheap: { provider: 'deepseek', model: 'deepseek-v4-flash' },
+        primary: { provider: 'minimax', model: 'minimax-m2.7', fallback: 'deepseek-v4-pro' },
+        strong: { provider: 'deepseek', model: 'deepseek-v4-pro' },
+      },
+      prompts: ['active-recall-analysis', 'feynman-evaluation', 'knowledge-import', 'learning-trend', 'review-card-generation'],
+      retry: { cheap: 2, primary: 3, strong: 3 },
     };
   }
-
-  @Get('usage')
-  @AdminRoles('SUPER_ADMIN' as AdminRole)
-  @ApiOperation({ summary: 'AI 调用日志' })
-  async usageLog() {
-    return this.usage['prisma']?.aiUsageLog?.findMany?.({ orderBy: { createdAt: 'desc' }, take: 50 }) || [];
-  }
 }