docs & cleanup: update stack info, remove dead code, fix backend bugs

- Fix AGENTS.md and 技术架构设计.md to reflect actual stack (Prisma+MySQL, static export, PM2)
- Remove 4 unused frontend components (page-transition, page-layout, image-upload, section-card)
- Fix card.tsx hardcoded colors → CSS variables
- Remove provider name from model selector, remove sensenova-u1-fast from models
- Fix analytics.controller.ts raw SQL table names (runtime bug)
- Add JWT auth guard to tools POST endpoint
- Fix AI gateway test: update env vars and model names
- Fix admin test: mock role structure for Prisma relation

backend/src/modules/ai/ai-gateway.service.ts

@@ -31,7 +31,7 @@ const MODEL_CATALOG: Record<string, ModelInfo> = {
   'gpt-4': { id: 'gpt-4', provider: 'OpenAI', capabilities: ['chat', 'code', 'vision'], contextWindow: 32768 },
   'deepseek-v4-flash': { id: 'deepseek-v4-flash', provider: '商汤科技', capabilities: ['chat', 'code'], contextWindow: 32768 },
   'sensenova-6.7-flash-lite': { id: 'sensenova-6.7-flash-lite', provider: '商汤科技', capabilities: ['chat', 'code'], contextWindow: 32768 },
-  'sensenova-u1-fast': { id: 'sensenova-u1-fast', provider: '商汤科技', capabilities: ['chat', 'code', 'vision'], contextWindow: 65536 },
+
 }
 
 @Injectable()
@@ -65,7 +65,7 @@ export class AIGatewayService {
       if (!apiUrl.endsWith('/chat/completions')) {
         apiUrl = apiUrl.replace(/\/+$/, '') + '/chat/completions';
       }
-      const models = ['deepseek-v4-flash', 'sensenova-6.7-flash-lite', 'sensenova-u1-fast'];
+      const models = ['deepseek-v4-flash', 'sensenova-6.7-flash-lite'];
       for (const modelName of models) {
         this.providers.set(modelName, new OpenAICompatibleProvider(
           process.env.SENSENOVA_API_KEY!,
@@ -88,7 +88,7 @@ export class AIGatewayService {
       'meituan/longcat-flash-lite': 'openai',
       'deepseek-v4-flash': 'deepseek-v4-flash',
       'sensenova-6.7-flash-lite': 'sensenova-6.7-flash-lite',
-      'sensenova-u1-fast': 'sensenova-u1-fast',
+      
     };
 
     const providerKey = modelMap[model.toLowerCase()] || (model.includes('/') ? 'openai' : model);
@@ -125,7 +125,7 @@ export class AIGatewayService {
       'meituan/longcat-flash-lite': 'openai',
       'deepseek-v4-flash': 'deepseek-v4-flash',
       'sensenova-6.7-flash-lite': 'sensenova-6.7-flash-lite',
-      'sensenova-u1-fast': 'sensenova-u1-fast',
+      
     };
 
     const providerKey = modelMap[model.toLowerCase()] || (model.includes('/') ? 'openai' : model);