Add ADS-B, AIS, and ALPR map layers with live CoT streaming (#36)

## Summary

- **ADS-B & AIS:** OpenSky and AISStream OSINT feeds upsert into the CoT store; tactical tracks still arrive via adsbcot/aiscot on `:8089`. Map clients subscribe via `GET /api/cot/stream` (SSE) with viewport bbox filtering and Air / Surface / Team layer toggles.
- **ALPR (Flock/OSM):** Toggleable license-plate reader layer sourced from OpenStreetMap, with SQLite cache, Overpass fallback, tiled viewport fetching, and clustered markers with direction cones.
- **Map performance:** Ring-based tile selection (fixes zoom-out crash), immutable tile cache, incremental marker sync, split cluster load/query, and padded SSE bbox to reduce reconnect churn.

## Docs

- `docs/tracking.md` — ADS-B/AIS accuracy tiers, freshness, self-hosted receivers, optional OSINT API keys
- `docs/map-and-cameras.md` — ALPR layer and map behavior updates

---------

Co-authored-by: Madison Grubb <madison@elastiflow.com>
Reviewed-on: #36

README.md

@@ -56,7 +56,7 @@ See [docs/live-streaming.md](docs/live-streaming.md) for setup and usage.
 
 ### ATAK / CoT (Cursor on Target)
 
-KestrelOS can act as a **TAK Server** so ATAK and iTAK devices connect and share positions. No plugins: in ATAK, add a **Server** connection (host = KestrelOS, port **8089** for CoT). Check **Use Authentication** and enter your **KestrelOS username** and **password** (local users use their login password; OIDC users must set an **ATAK password** once under **Account** in the web app). Devices relay CoT to each other (team members see each other on the ATAK map) and appear on the KestrelOS web map; they drop off after ~90 seconds if no updates. Optional: set `COT_TTL_MS`, `COT_REQUIRE_AUTH`; CoT runs on port 8089 (default).
+KestrelOS can act as a **TAK Server** so ATAK and iTAK devices connect and share positions. No plugins: in ATAK, add a **Server** connection (host = KestrelOS, port **8089** for CoT). Check **Use Authentication** and enter your **KestrelOS username** and **password** (local users use their login password; OIDC users must set an **ATAK password** once under **Account** in the web app). Devices relay CoT to each other (team members see each other on the ATAK map) and appear on the KestrelOS web map; they drop off after ~90 seconds if no updates. CoT runs on port 8089 (default).
 
 ## Scripts
 
@@ -74,7 +74,7 @@ Full docs are in the **[docs/](docs/README.md)** directory: [installation](docs/
 ## Configuration
 
 - **Devices**: Manage cameras/devices via the API (`/api/devices`); see [Map and cameras](docs/map-and-cameras.md). Each device needs `name`, `device_type`, `lat`, `lng`, `stream_url`, and `source_type` (`mjpeg` or `hls`).
-- **Environment**: No required env vars for basic run. For production, set `HOST=0.0.0.0` and expose ports 3000 (web/API) and 8089 (CoT). Set `COT_TTL_MS=90000`, `COT_REQUIRE_AUTH=true`. For TLS use `.dev-certs/` or set `COT_SSL_CERT` and `COT_SSL_KEY`.
+- **Environment**: No required env vars for basic run. For production, set `HOST=0.0.0.0` and expose ports 3000 (web/API) and 8089 (CoT). For TLS use `.dev-certs/` or set `COT_SSL_CERT` and `COT_SSL_KEY`.
 - **Authentication**: The login page always offers password sign-in (local). Optionally set `BOOTSTRAP_EMAIL` and `BOOTSTRAP_PASSWORD` before the first run to create the first admin; otherwise a default admin is created and its credentials are printed in the terminal. To also show an OIDC sign-in button, configure `OIDC_ISSUER`, `OIDC_CLIENT_ID`, `OIDC_CLIENT_SECRET`, and optionally `OIDC_LABEL`, `OIDC_REDIRECT_URI`. See [docs/auth.md](docs/auth.md) for local login, OIDC config, and sign up.
 - **Bootstrap admin** (when using local auth): The server initializes the database and runs bootstrap at startup. On first run (no users in the database), it creates the first admin. If you set `BOOTSTRAP_EMAIL` and `BOOTSTRAP_PASSWORD` before starting, that account is created. If you don't set them, a default admin is created (identifier: `admin`) with a random password and the credentials are printed in the terminal-copy them and sign in at `/login`, then change the password or add users via Members. Use **Members** to change roles (admin, leader, member). Only admins can change roles; admins and leaders can edit POIs.
 - **Database**: SQLite file at `data/kestrelos.db` (created automatically). Contains users, sessions, and POIs.