- Add two airports (north/south) with full geometry: runways, taxiways,
aprons, terminals, hangars, stands, and helipads; walkable airport
grounds extend beyond city bounds.
- Introduce ATC AI agent ("Torre de Controle City10") using AI_ATC_MODEL
to generate takeoff clearances; includes dispatch endpoint with
30-second cooldown and deterministic fallback on failure.
- Implement AI model fallback chain: preferred model → AI_FALLBACK_MODEL
before failing, applied in ChatController and PersonTalkController.
- Add luminous sign labels (letreiros) for plazas, beach, food, hospital,
school, city hall, and airports with day/night glow.
- Fix city presence cache: compute is_me per viewer instead of baking
into shared per-second cache to prevent cross-user flag leakage.
- Add tests: AirportTest, CityPresenceTest, SignLabelsTest, and
PersonTalkTest fallback model retry scenario.
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