feat(dc): Complete Tool C quick action buttons Phase 1-2 - 7 functions

Summary:
- Implement 7 quick action functions (filter, recode, binning, conditional, dropna, compute, pivot)
- Refactor to pre-written Python functions architecture (stable and secure)
- Add 7 Python operations modules with full type hints
- Add 7 frontend Dialog components with user-friendly UI
- Fix NaN serialization issues and auto type conversion
- Update all related documentation

Technical Details:
- Python: operations/ module (filter.py, recode.py, binning.py, conditional.py, dropna.py, compute.py, pivot.py)
- Backend: QuickActionService.ts with 7 execute methods
- Frontend: 7 Dialog components with complete validation
- Toolbar: Enable 7 quick action buttons

Status: Phase 1-2 completed, basic testing passed, ready for further testing

backend/src/modules/dc/tool-c/routes/index.ts

@@ -8,6 +8,8 @@ import { FastifyInstance } from 'fastify';
 import { testController } from '../controllers/TestController.js';
 import { sessionController } from '../controllers/SessionController.js';
 import { aiController } from '../controllers/AIController.js';
+import { streamAIController } from '../controllers/StreamAIController.js';
+import { quickActionController } from '../controllers/QuickActionController.js';
 
 export async function toolCRoutes(fastify: FastifyInstance) {
   // ==================== 测试路由（Day 1） ====================
@@ -85,5 +87,29 @@ export async function toolCRoutes(fastify: FastifyInstance) {
   fastify.get('/ai/history/:sessionId', {
     handler: aiController.getHistory.bind(aiController),
   });
+
+  // ✨ 流式AI处理（新增）
+  fastify.post('/ai/stream-process', {
+    handler: streamAIController.streamProcess.bind(streamAIController),
+  });
+
+  // ==================== 导出功能（新增） ====================
+
+  // 导出Excel文件
+  fastify.get('/sessions/:id/export', {
+    handler: sessionController.exportData.bind(sessionController),
+  });
+
+  // ==================== 快速操作（功能按钮） ====================
+
+  // 执行快速操作
+  fastify.post('/quick-action', {
+    handler: quickActionController.execute.bind(quickActionController),
+  });
+
+  // 预览操作结果
+  fastify.post('/quick-action/preview', {
+    handler: quickActionController.preview.bind(quickActionController),
+  });
 }