Complete FRE-574 technical specifications

- Marked FRE-574 as done
- Unblocked FRE-588 (Database schema)
- All 12 child issues assigned to Founding Engineer
- 6/13 MVP subtasks complete (46%)

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

server/trpc/index.ts

@@ -9,7 +9,7 @@ import { t } from './router';
 export const appRouter = t.router({
   project: projectRouter,
   revisions: revisionsRouter,
-});
+} as const);
 
 export type AppRouter = typeof appRouter;