feat: add states CRUD API route with project-scoped workflow states

- Add states.ts with GET/POST/PATCH/DELETE endpoints
- States scoped to project via projectId FK; workspace access resolved through project
- stateGroupEnum enforced (backlog|unstarted|started|completed|cancelled)
- List ordered by sortOrder, auto-increment on create
- Soft-delete via deletedAt column (added to schema)
- 3-step contract on every write: DB write, activity feed, pg_notify
- Register /api/states route in main index.ts
- Default state seeding already present in projects.ts

apps/api/src/index.ts

@@ -26,6 +26,7 @@ import { analyticsRoutes } from "./routes/analytics";
 import { activityRoutes } from "./routes/activity";
 import { importExportRoutes } from "./routes/import-export";
 import { notificationRoutes } from "./routes/notifications";
+import { stateRoutes } from "./routes/states";
 import { healthHandler } from "./routes/health";
 
 const app = new Hono();
@@ -62,6 +63,7 @@ app.route("/api/error-log", errorLogRoutes);
 app.route("/api/analytics", analyticsRoutes);
 app.route("/api/activity", activityRoutes);
 app.route("/api/notifications", notificationRoutes);
+app.route("/api/states", stateRoutes);
 app.route("/api", importExportRoutes);
 app.route("/api", realtimeRoutes);
 app.route("/api/mcp", mcpRoutes);