fix: correct user context handling and error responses

- Fix SearchMediaItems to retrieve user object from context instead of string
- Remove redundant UUID parsing, use user.ID directly
- Add error logging for search failures with query details
- Fix JWT middleware to use echo.NewHTTPError for consistent error format
- Improves debugging and error response consistency across API

internal/router/router.go

@@ -83,7 +83,7 @@ func createJWTMiddleware(cfg *Config) echo.MiddlewareFunc {
 			userIDStr, _ := claims["user_id"].(string)
 			userUUID, err := uuid.Parse(userIDStr)
 			if err != nil {
-				c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid user ID in token"})
+				c.Error(echo.NewHTTPError(http.StatusBadRequest, "invalid user ID in token"))
 				return
 			}