feat: add knowledge management functionality with CRUD operations and database schema

- Implemented KnowledgeHandler for managing knowledge groups and items, including listing, creating, updating, and deleting operations.
- Added database migration scripts to create necessary tables for knowledge management, including knowledge_groups, knowledge_items, knowledge_parse_tasks, and knowledge_chunks_meta.
- Introduced prompt_rule_knowledge_groups table to associate prompt rules with knowledge groups.

server/internal/shared/response/response.go

@@ -6,6 +6,8 @@ import (
 	"github.com/gin-gonic/gin"
 )
 
+const ginAppErrorKey = "app_error"
+
 type AppError struct {
 	HTTPStatus int    `json:"-"`
 	Code       int    `json:"code"`
@@ -41,6 +43,8 @@ func SuccessWithStatus(c *gin.Context, status int, data interface{}) {
 
 func Error(c *gin.Context, err error) {
 	appErr := Normalize(err)
+	c.Set(ginAppErrorKey, appErr)
+	_ = c.Error(appErr)
 	c.JSON(appErr.HTTPStatus, gin.H{
 		"code":       appErr.Code,
 		"message":    appErr.Message,
@@ -62,6 +66,18 @@ func Normalize(err error) *AppError {
 	}
 }
 
+func AppErrorFromGin(c *gin.Context) (*AppError, bool) {
+	if c == nil {
+		return nil, false
+	}
+	value, ok := c.Get(ginAppErrorKey)
+	if !ok || value == nil {
+		return nil, false
+	}
+	appErr, ok := value.(*AppError)
+	return appErr, ok && appErr != nil
+}
+
 func getRequestID(c *gin.Context) string {
 	if rid, ok := c.Get("request_id"); ok {
 		return rid.(string)