Add missing server delete: handler, route, and UI button

DeleteServer already existed in the store layer (refuses if clients
still reference the server) but was never wired up anywhere, so there
was no way to actually remove a server from the UI or API.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

handler/routes.go

@@ -709,6 +709,19 @@ func CreateServer(db store.IStore) echo.HandlerFunc {
 	}
 }
 
+// RemoveServer handler deletes a server, refusing if any client still
+// references it (see store.DeleteServer). Admin-only.
+func RemoveServer(db store.IStore) echo.HandlerFunc {
+	return func(c echo.Context) error {
+		serverID := c.Param("id")
+		if err := db.DeleteServer(serverID); err != nil {
+			return c.JSON(http.StatusBadRequest, jsonHTTPResponse{false, err.Error()})
+		}
+		log.Infof("Removed server %s", serverID)
+		return c.JSON(http.StatusOK, jsonHTTPResponse{true, "Server removed successfully"})
+	}
+}
+
 // NewClient handler
 func NewClient(db store.IStore) echo.HandlerFunc {
 	return func(c echo.Context) error {