feat(api): FastAPI bridge for pont bascule via serial + Tailscale access
- Add FastAPI service exposing /health, /last, /send/esclave, /send/dsd, /send/custom
- Implement SerialBridge aligned with legacy Tkinter behavior (open delay 2s, post-write 0.5s, read in_waiting once)
- Enforce single in-flight serial request (non-blocking lock, returns 409 BUSY)
- Add environment-based serial configuration (.env + systemd EnvironmentFile)
- Document installation, systemd service, and Tailscale usage (direct IP and tailscale serve)