Add guarded dev restart handling

Co-Authored-By: Paperclip <noreply@paperclip.ing>

ui/src/api/health.ts

@@ -1,3 +1,17 @@
+export type DevServerHealthStatus = {
+  enabled: true;
+  restartRequired: boolean;
+  reason: "backend_changes" | "pending_migrations" | "backend_changes_and_pending_migrations" | null;
+  lastChangedAt: string | null;
+  changedPathCount: number;
+  changedPathsSample: string[];
+  pendingMigrations: string[];
+  autoRestartEnabled: boolean;
+  activeRunCount: number;
+  waitingForIdle: boolean;
+  lastRestartAt: string | null;
+};
+
 export type HealthStatus = {
   status: "ok";
   version?: string;
@@ -9,6 +23,7 @@ export type HealthStatus = {
   features?: {
     companyDeletionEnabled?: boolean;
   };
+  devServer?: DevServerHealthStatus;
 };
 
 export const healthApi = {