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>

packages/types/src/index.test.ts

@@ -1,5 +1,5 @@
 import { describe, it, expect } from "vitest";
-import type { Waypoint, Route } from "./index";
+import type { Waypoint, Route } from "./index.ts";
 
 describe("types", () => {
   it("Waypoint type accepts valid data", () => {