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/gpx/src/generate.test.ts

@@ -1,6 +1,6 @@
 import { describe, it, expect } from "vitest";
-import { generateGpx } from "./generate";
-import { parseGpx } from "./parse";
+import { generateGpx } from "./generate.ts";
+import { parseGpx } from "./parse.ts";
 
 describe("generateGpx", () => {
   it("generates valid GPX with name", () => {

packages/gpx/src/generate.ts

@@ -1,5 +1,5 @@
 import type { Waypoint } from "@trails-cool/types";
-import type { TrackPoint } from "./types";
+import type { TrackPoint } from "./types.ts";
 
 /**
  * Generate a GPX XML string from waypoints and track points.

packages/gpx/src/index.ts

@@ -1,3 +1,3 @@
-export { parseGpx, parseGpxAsync } from "./parse";
-export { generateGpx } from "./generate";
-export type { GpxData, TrackPoint, ElevationProfile } from "./types";
+export { parseGpx, parseGpxAsync } from "./parse.ts";
+export { generateGpx } from "./generate.ts";
+export type { GpxData, TrackPoint, ElevationProfile } from "./types.ts";

packages/gpx/src/parse.test.ts

@@ -1,5 +1,5 @@
 import { describe, it, expect } from "vitest";
-import { parseGpx } from "./parse";
+import { parseGpx } from "./parse.ts";
 
 const sampleGpx = `<?xml version="1.0" encoding="UTF-8"?>
 <gpx version="1.1" creator="test" xmlns="http://www.topografix.com/GPX/1/1">

packages/gpx/src/parse.ts

@@ -1,5 +1,5 @@
 import type { Waypoint } from "@trails-cool/types";
-import type { GpxData, TrackPoint, ElevationProfile } from "./types";
+import type { GpxData, TrackPoint, ElevationProfile } from "./types.ts";
 
 /**
  * Parse a GPX XML string into structured data.