feat: migrate app to local Fastify and Postgres stack

Replace Supabase auth and search runtime with a local Fastify API, PostgreSQL/PostGIS schema, and local session handling. Scaffold the worker and deep-research foundations while keeping the existing research, dashboard, and map flows running on the new backend.

tsconfig.json

@@ -23,5 +23,5 @@
     "allowImportingTsExtensions": true,
     "noEmit": true
   },
-  "include": ["src", "vite.config.ts"]
+  "include": ["src", "shared", "vite.config.ts"]
 }