Fix planner production server + use .ts extensions everywhere

- Fix createRequestHandler → createRequestListener (@react-router/node
  removed the old API)
- Move noEmit + allowImportingTsExtensions to tsconfig.base.json so all
  packages and apps inherit them consistently
- Add explicit .ts extensions to all remaining relative imports across
  packages and apps

Verified locally: node --experimental-strip-types server.ts starts and
responds 200.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tsconfig.base.json

@@ -14,7 +14,9 @@
     "declaration": true,
     "declarationMap": true,
     "sourceMap": true,
-    "noUncheckedIndexedAccess": true
+    "noUncheckedIndexedAccess": true,
+    "noEmit": true,
+    "allowImportingTsExtensions": true
   },
   "exclude": ["node_modules", "build", "dist"]
 }