chore: initial checkpoint - Tesla Roadtrip planner

- Proactive Grok integration (xAI API + local CLI fallback)
- Real road routing via OSRM (no more bird's-eye lines)
- Heavy structured logging for fast iteration
- Strong sanitization + geocoding + ErrorBoundary (no black screens)
- Playwright E2E tests (API diagnostic + full UI flow)
- scripts/dev.sh for one-command startup
- Clean .env.example + documentation

This is a stable checkpoint before further prompt/UI refinement.

server/lib/logger.ts

@@ -0,0 +1,11 @@
+import pino from 'pino';
+
+export const logger = pino({
+  level: process.env.LOG_LEVEL || (process.env.NODE_ENV === 'production' ? 'info' : 'debug'),
+  transport: process.env.NODE_ENV !== 'production'
+    ? { target: 'pino-pretty', options: { colorize: true } }
+    : undefined,
+});
+
+// Helper used across the server (consistent with other projects)
+export const createLogger = (module: string) => logger.child({ module });