feat: 完善知识库后端 API

- 添加 KnowledgeHandler 处理知识库请求
- 注册知识库 CRUD 路由
- 添加文档上传、删除、解析、预览接口
- 更新数据库模型和迁移

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/cmd/api/main.go

@@ -70,12 +70,13 @@ func main() {
 	}
 
 	// 3. 自动迁移表
-	db.AutoMigrate(&model.DatabaseInfo{}, &model.SubTableInfo{}, &model.ModelInfo{})
+	db.AutoMigrate(&model.DatabaseInfo{}, &model.SubTableInfo{}, &model.ModelInfo{}, &model.KnowledgeBase{}, &model.KnowledgeDocument{})
 
 	// 4. 初始化 Repository
 	dbRepo := repository.NewDatabaseRepository(db)
 	subTableRepo := repository.NewSubTableRepository(db)
 	modelRepo := repository.NewModelRepository(db)
+	knowledgeRepo := repository.NewKnowledgeRepository(db)
 
 	// 5. 初始化 Service
 	dbService := service.NewDatabaseService(dbRepo, subTableRepo)
@@ -86,6 +87,7 @@ func main() {
 	if err != nil {
 		log.Printf("Warning: Failed to initialize upload service: %v (files will not be available)", err)
 	}
+	knowledgeService := service.NewKnowledgeService(knowledgeRepo, modelRepo, uploadService, cfg.PythonServiceURL)
 
 	// 6. 初始化 Handler
 	dbHandler := handler.NewDatabaseHandler(dbService)
@@ -93,6 +95,7 @@ func main() {
 	neo4jHandler := handler.NewNeo4jHandler(neo4jService)
 	modelHandler := handler.NewModelHandler(modelService)
 	systemHandler := handler.NewSystemHandler()
+	knowledgeHandler := handler.NewKnowledgeHandler(knowledgeService)
 	var uploadHandler *handler.UploadHandler
 	if uploadService != nil {
 		uploadHandler = handler.NewUploadHandler(uploadService)
@@ -185,6 +188,22 @@ func main() {
 		modelGroup.DELETE("/:id", modelHandler.Delete)
 	}
 
+	// 知识库管理模块
+	knowledgeGroup := r.Group("/api/knowledge")
+	{
+		knowledgeGroup.POST("/create", knowledgeHandler.Create)
+		knowledgeGroup.GET("/list", knowledgeHandler.List)
+		knowledgeGroup.GET("/:id", knowledgeHandler.GetByID)
+		knowledgeGroup.PUT("/:id", knowledgeHandler.Update)
+		knowledgeGroup.DELETE("/:id", knowledgeHandler.Delete)
+		// 文档管理
+		knowledgeGroup.GET("/:id/documents", knowledgeHandler.ListDocuments)
+		knowledgeGroup.POST("/:id/documents", knowledgeHandler.UploadDocument)
+		knowledgeGroup.DELETE("/:id/documents/:doc_id", knowledgeHandler.DeleteDocument)
+		knowledgeGroup.POST("/:id/documents/:doc_id/reparse", knowledgeHandler.ReparseDocument)
+		knowledgeGroup.GET("/:id/documents/:doc_id/preview", knowledgeHandler.GetDocumentPreview)
+	}
+
 	// 系统信息模块
 	r.GET("/system/info", systemHandler.GetSystemInfo)
 
@@ -195,8 +214,8 @@ func main() {
 			r.Static("/files", cfg.UploadLocalPath)
 		}
 		// 上传路由
-		r.POST("/upload", uploadHandler.Upload)
-		r.DELETE("/upload/:filename", uploadHandler.Delete)
+		r.POST("/api/file_upload", uploadHandler.Upload)
+		r.DELETE("/api/file_upload/:filename", uploadHandler.Delete)
 	}
 
 	// 8. 启动服务