fix: use correct mock user ID in conversation controller

Changed userId from '1' to 'user-mock-001' in all conversation controller methods to match the actual mock user created in database.

This fixes the 400 error when creating conversations.

backend/src/controllers/conversationController.ts

@@ -18,7 +18,7 @@ export class ConversationController {
   ) {
     try {
       // TODO: 从JWT token获取userId
-      const userId = '1'; // 临时硬编码
+      const userId = 'user-mock-001'; // 临时使用模拟用户
 
       const { projectId, agentId, title } = request.body;
 
@@ -54,7 +54,7 @@ export class ConversationController {
   ) {
     try {
       // TODO: 从JWT token获取userId
-      const userId = '1';
+      const userId = 'user-mock-001';
 
       const projectId = request.query.projectId;
 
@@ -88,7 +88,7 @@ export class ConversationController {
   ) {
     try {
       // TODO: 从JWT token获取userId
-      const userId = '1';
+      const userId = 'user-mock-001';
 
       const conversationId = request.params.id;
 
@@ -125,7 +125,7 @@ export class ConversationController {
   ) {
     try {
       // TODO: 从JWT token获取userId
-      const userId = '1';
+      const userId = 'user-mock-001';
 
       const { conversationId, content, modelType, knowledgeBaseIds } =
         request.body;
@@ -177,7 +177,7 @@ export class ConversationController {
   ) {
     try {
       // TODO: 从JWT token获取userId
-      const userId = '1';
+      const userId = 'user-mock-001';
 
       const { conversationId, content, modelType, knowledgeBaseIds } =
         request.body;
@@ -240,7 +240,7 @@ export class ConversationController {
   ) {
     try {
       // TODO: 从JWT token获取userId
-      const userId = '1';
+      const userId = 'user-mock-001';
 
       const conversationId = request.params.id;