feat: complete Day 21-24 knowledge base features

- Day 21-22: fix CORS and file upload issues
- Day 23-24: implement @knowledge base search and conversation integration
- Backend: integrate Dify RAG into conversation system
- Frontend: load knowledge base list and @ reference feature

backend/check-docs-api.ps1

@@ -0,0 +1,70 @@
+# 通过API查询文档状态
+Write-Host "`n📋 查询知识库和文档状态...`n" -ForegroundColor Green
+
+# 获取知识库列表
+try {
+    $response = Invoke-RestMethod -Uri "http://localhost:3001/api/v1/knowledge-bases" -Method GET
+    
+    if ($response.data.Count -eq 0) {
+        Write-Host "❌ 没有找到任何知识库" -ForegroundColor Red
+        exit
+    }
+    
+    Write-Host "找到 $($response.data.Count) 个知识库：`n" -ForegroundColor Cyan
+    
+    foreach ($kb in $response.data) {
+        Write-Host "📚 知识库: $($kb.name)" -ForegroundColor Yellow
+        Write-Host "   ID: $($kb.id)"
+        Write-Host "   描述: $($kb.description)"
+        Write-Host "   文件数: $($kb.fileCount)"
+        Write-Host "   创建时间: $($kb.createdAt)"
+        
+        # 获取该知识库的文档列表
+        try {
+            $docsResponse = Invoke-RestMethod -Uri "http://localhost:3001/api/v1/knowledge-bases/$($kb.id)/documents" -Method GET
+            
+            if ($docsResponse.data.Count -gt 0) {
+                Write-Host "`n   📄 文档列表：" -ForegroundColor Cyan
+                
+                foreach ($doc in $docsResponse.data) {
+                    $statusEmoji = switch ($doc.status) {
+                        "uploading" { "📤" }
+                        "parsing" { "🔄" }
+                        "indexing" { "⚙️" }
+                        "completed" { "✅" }
+                        "error" { "❌" }
+                        default { "❓" }
+                    }
+                    
+                    Write-Host "   $statusEmoji $($doc.filename)" -ForegroundColor White
+                    Write-Host "      状态: $($doc.status)"
+                    Write-Host "      大小: $([math]::Round($doc.fileSizeBytes / 1024, 2)) KB"
+                    Write-Host "      上传时间: $($doc.uploadedAt)"
+                    
+                    if ($doc.status -eq "completed") {
+                        Write-Host "      ✓ 段落数: $($doc.segmentsCount)" -ForegroundColor Green
+                        Write-Host "      ✓ Token数: $($doc.tokensCount)" -ForegroundColor Green
+                    }
+                    
+                    if ($doc.status -eq "error" -and $doc.errorMessage) {
+                        Write-Host "      ✗ 错误: $($doc.errorMessage)" -ForegroundColor Red
+                    }
+                    
+                    Write-Host ""
+                }
+            } else {
+                Write-Host "   （该知识库暂无文档）`n"
+            }
+            
+        } catch {
+            Write-Host "   ❌ 获取文档列表失败: $($_.Exception.Message)" -ForegroundColor Red
+        }
+        
+        Write-Host ("-" * 60)
+        Write-Host ""
+    }
+    
+} catch {
+    Write-Host "❌ 查询失败: $($_.Exception.Message)" -ForegroundColor Red
+}
+

backend/check-documents.js

@@ -0,0 +1,64 @@
+// 查询文档状态脚本
+const { PrismaClient } = require('@prisma/client');
+
+const prisma = new PrismaClient();
+
+async function checkDocuments() {
+  try {
+    console.log('\n📋 查询最近上传的文档...\n');
+    
+    const docs = await prisma.document.findMany({
+      orderBy: { uploadedAt: 'desc' },
+      take: 10,
+      include: {
+        knowledgeBase: {
+          select: {
+            name: true,
+          }
+        }
+      }
+    });
+    
+    if (docs.length === 0) {
+      console.log('❌ 没有找到任何文档');
+      return;
+    }
+    
+    console.log(`找到 ${docs.length} 个文档：\n`);
+    
+    docs.forEach((doc, index) => {
+      const statusEmoji = {
+        'uploading': '📤',
+        'parsing': '🔄',
+        'indexing': '⚙️',
+        'completed': '✅',
+        'error': '❌'
+      }[doc.status] || '❓';
+      
+      console.log(`${index + 1}. ${statusEmoji} ${doc.filename}`);
+      console.log(`   知识库: ${doc.knowledgeBase.name}`);
+      console.log(`   状态: ${doc.status}`);
+      console.log(`   大小: ${(doc.fileSizeBytes / 1024).toFixed(2)} KB`);
+      console.log(`   上传时间: ${doc.uploadedAt}`);
+      
+      if (doc.status === 'completed') {
+        console.log(`   ✓ 段落数: ${doc.segmentsCount || 0}`);
+        console.log(`   ✓ Token数: ${doc.tokensCount || 0}`);
+      }
+      
+      if (doc.status === 'error' && doc.errorMessage) {
+        console.log(`   ✗ 错误: ${doc.errorMessage}`);
+      }
+      
+      console.log('');
+    });
+    
+  } catch (error) {
+    console.error('❌ 查询失败:', error.message);
+  } finally {
+    await prisma.$disconnect();
+  }
+}
+
+checkDocuments();
+

backend/src/index.ts

@@ -8,12 +8,6 @@ import { agentRoutes } from './routes/agents.js';
 import { conversationRoutes } from './routes/conversations.js';
 import knowledgeBaseRoutes from './routes/knowledgeBases.js';
 
-console.log('\n' + '='.repeat(60));
-console.log('🔧 正在加载修复后的服务器配置...');
-console.log('📅 修复版本: 2025-10-11 - CORS完整配置');
-console.log('='.repeat(60) + '\n');
-
-console.log('🚨🚨🚨 测试日志: 文件已加载 🚨🚨🚨');
 
 // 全局处理BigInt序列化
 (BigInt.prototype as any).toJSON = function() {
@@ -54,10 +48,6 @@ await fastify.register(multipart, {
 });
 console.log('✅ 文件上传插件已配置: 最大文件大小 10MB');
 
-// 添加请求日志钩子（用于调试）
-fastify.addHook('onRequest', async (request, _reply) => {
-  console.log(`📥 ${request.method} ${request.url} - Origin: ${request.headers.origin || 'none'}`);
-});
 
 // 健康检查路由
 fastify.get('/health', async () => {

backend/src/services/conversationService.ts

@@ -2,6 +2,7 @@ import { prisma } from '../config/database.js';
 import { LLMFactory } from '../adapters/LLMFactory.js';
 import { Message, ModelType, StreamChunk } from '../adapters/types.js';
 import { agentService } from './agentService.js';
+import * as knowledgeBaseService from './knowledgeBaseService.js';
 
 interface CreateConversationData {
   userId: string;
@@ -217,8 +218,44 @@ export class ConversationService {
     // 获取知识库上下文（如果有@知识库）
     let knowledgeBaseContext = '';
     if (knowledgeBaseIds && knowledgeBaseIds.length > 0) {
-      // TODO: 调用Dify RAG获取知识库上下文
-      knowledgeBaseContext = '相关文献内容...';
+      const knowledgeResults: string[] = [];
+      
+      // 对每个知识库进行检索
+      for (const kbId of knowledgeBaseIds) {
+        try {
+          const searchResult = await knowledgeBaseService.searchKnowledgeBase(
+            userId,
+            kbId,
+            content,
+            3 // 每个知识库返回3个最相关的段落
+          );
+
+          // 格式化检索结果
+          if (searchResult.records && searchResult.records.length > 0) {
+            const kbInfo = await prisma.knowledgeBase.findUnique({
+              where: { id: kbId },
+              select: { name: true },
+            });
+
+            knowledgeResults.push(
+              `【知识库：${kbInfo?.name || '未命名'}】\n` +
+              searchResult.records
+                .map((record: any, index: number) => {
+                  const score = (record.score * 100).toFixed(1);
+                  return `${index + 1}. [相关度${score}%] ${record.segment.content}`;
+                })
+                .join('\n\n')
+            );
+          }
+        } catch (error) {
+          console.error(`Failed to search knowledge base ${kbId}:`, error);
+          // 检索失败不阻止对话，继续处理
+        }
+      }
+
+      if (knowledgeResults.length > 0) {
+        knowledgeBaseContext = knowledgeResults.join('\n\n---\n\n');
+      }
     }
 
     // 组装上下文
@@ -299,8 +336,44 @@ export class ConversationService {
     // 获取知识库上下文（如果有@知识库）
     let knowledgeBaseContext = '';
     if (knowledgeBaseIds && knowledgeBaseIds.length > 0) {
-      // TODO: 调用Dify RAG获取知识库上下文
-      knowledgeBaseContext = '相关文献内容...';
+      const knowledgeResults: string[] = [];
+      
+      // 对每个知识库进行检索
+      for (const kbId of knowledgeBaseIds) {
+        try {
+          const searchResult = await knowledgeBaseService.searchKnowledgeBase(
+            userId,
+            kbId,
+            content,
+            3 // 每个知识库返回3个最相关的段落
+          );
+
+          // 格式化检索结果
+          if (searchResult.records && searchResult.records.length > 0) {
+            const kbInfo = await prisma.knowledgeBase.findUnique({
+              where: { id: kbId },
+              select: { name: true },
+            });
+
+            knowledgeResults.push(
+              `【知识库：${kbInfo?.name || '未命名'}】\n` +
+              searchResult.records
+                .map((record: any, index: number) => {
+                  const score = (record.score * 100).toFixed(1);
+                  return `${index + 1}. [相关度${score}%] ${record.segment.content}`;
+                })
+                .join('\n\n')
+            );
+          }
+        } catch (error) {
+          console.error(`Failed to search knowledge base ${kbId}:`, error);
+          // 检索失败不阻止对话，继续处理
+        }
+      }
+
+      if (knowledgeResults.length > 0) {
+        knowledgeBaseContext = knowledgeResults.join('\n\n---\n\n');
+      }
     }
 
     // 组装上下文