Go: add delete search (#14014)

### What problem does this PR solve?

As title.

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

---------

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

internal/handler/search.go

@@ -251,3 +251,61 @@ func (h *SearchHandler) GetSearch(c *gin.Context) {
 		"message": "success",
 	})
 }
+
+// DeleteSearch delete a search app
+// @Summary Delete Search App
+// @Description Delete a search app by ID
+// @Tags search
+// @Accept json
+// @Produce json
+// @Param search_id path string true "search app ID"
+// @Success 200 {object} map[string]interface{}
+// @Router /api/v1/searches/{search_id} [delete]
+func (h *SearchHandler) DeleteSearch(c *gin.Context) {
+	// Get current user from context (same as Python current_user)
+	user, errorCode, errorMessage := GetUser(c)
+	if errorCode != common.CodeSuccess {
+		jsonError(c, errorCode, errorMessage)
+		return
+	}
+	userID := user.ID
+
+	// Get search_id from path parameter (same as Python <search_id>)
+	searchID := c.Param("search_id")
+	if searchID == "" {
+		c.JSON(http.StatusBadRequest, gin.H{
+			"code":    common.CodeBadRequest,
+			"data":    nil,
+			"message": "search_id is required",
+		})
+		return
+	}
+
+	// Delete search with permission check
+	err := h.searchService.DeleteSearch(userID, searchID)
+	if err != nil {
+		// Check if it's an authorization error
+		if err.Error() == "no authorization" {
+			c.JSON(http.StatusOK, gin.H{
+				"code":    common.CodeAuthenticationError,
+				"data":    false,
+				"message": "No authorization.",
+			})
+			return
+		}
+		// Delete failed error
+		c.JSON(http.StatusOK, gin.H{
+			"code":    common.CodeDataError,
+			"data":    nil,
+			"message": err.Error(),
+		})
+		return
+	}
+
+	// Return success response (same as Python get_json_result(data=True))
+	c.JSON(http.StatusOK, gin.H{
+		"code":    common.CodeSuccess,
+		"data":    true,
+		"message": "success",
+	})
+}