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.

.gitignore

@@ -0,0 +1,45 @@
+# Dependencies
+node_modules/
+client/node_modules/
+
+# Environment variables
+.env
+.env.local
+.env.*.local
+
+# Build outputs
+dist/
+client/dist/
+build/
+
+# Playwright
+test-results/
+playwright-report/
+playwright/.cache/
+
+# Logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# OS files
+.DS_Store
+Thumbs.db
+
+# Editor directories
+.vscode/
+.idea/
+*.swp
+*.swo
+
+# Prisma generated client (generated at runtime)
+prisma/generated/
+
+# Atlas local files (if any)
+atlas/migrations/*_dev/
+
+# Temporary files
+*.tmp
+*.temp
+.cache/