feat(cctv): seven camera packs, semantic labels, terrain-clear monitor planes (#433)

Seven contributed CCTV camera packs (Ontario 511, Fintraffic Finland, DriveBC, TxDOT Texas, Estonia Tallinn + Tarktee, Warendorf, Live Traffic NSW) on a fair per-pack catalog cap; semantic camera labels; monitor planes lifted clear of the terrain from a precomputed, bundled ground-height dataset. Default catalog 800 → 3,446 cameras. Full context in PR #433.

Co-authored-by: sendmebits <[email protected]>
Co-authored-by: avocadoAgent <[email protected]>
Co-authored-by: Alex Harvey <[email protected]>
Co-authored-by: Jason Meredith <[email protected]>
Co-authored-by: Daniel Smith <[email protected]>
Co-authored-by: Vladimir Sobolev <[email protected]>
Co-authored-by: Matthias Schneider <[email protected]>
Co-authored-by: Cyber Knight <[email protected]>
Co-authored-by: NovaSoft Australia <[email protected]>

README.md

@@ -188,7 +188,7 @@ Choose a first-run mission, or try these in order. The GIFs show Google Photorea
 
 ![Moving from a full airport overhead down to close taxiway inspection with 3D flight models](docs/media/start-here/airport-ground-traffic-google-3d.gif)
 
-4. **Look through a public camera.** Turn on **CCTV** over Austin, London, or California. The feeds aren't webcam embeds — they project *into* the 3D city. Cycle coverage to **VIEWSHED** and every camera draws its estimated coverage volume — where it reaches, and where it goes blind.
+4. **Look through a public camera.** Turn on **CCTV** over Austin, London, California, or Finland. The feeds aren't webcam embeds — they project *into* the 3D city. Cycle coverage to **VIEWSHED** and every camera draws its estimated coverage volume — where it reaches, and where it goes blind.
 
 ![Diving into an Austin intersection with a live public camera projected into the 3D scene](docs/media/03-austin-cctv.gif)
 
@@ -275,7 +275,7 @@ Thirteen layers and map sources. **Eleven have a keyless path.** Some offer addi
 | 🛰️ **Satellites** | 838-object catalog, color-coded by class with a live legend — the **DENSE** chip drops in the whole Starlink shell | CelesTrak | 🟢 |
 | 🌍 **Earthquakes** | Global seismic activity, last 24h | USGS | 🟢 |
 | 🚗 **Traffic** | Simulated vehicles on OSM roads. With TomTom, live flow speeds drive the simulation and congestion colors below ~8 km; individual vehicle positions are not live observations | TomTom + OSM | 🟢 simulation · 🟡 live flow speeds |
-| 📹 **CCTV Mesh** | ~800 public cameras projected *into* the 3D space — Austin · California (Caltrans) · London (TfL). Positions are published; poses are estimated priors **you calibrate by dragging a gizmo on the camera itself** | City APIs | 🟢 |
+| 📹 **CCTV Mesh** | ~3,400 public cameras projected *into* the 3D space — Austin · Texas (TxDOT) · California (Caltrans) · London (TfL) · Ontario (511) · Finland (Fintraffic) · British Columbia (DriveBC) · Estonia (Tallinn, Tarktee) · New South Wales (Live Traffic NSW). Positions are published; poses are estimated priors **you calibrate by dragging a gizmo on the camera itself** | City APIs | 🟢 |
 | 📻 **Radio** | Geolocated world radio with an **analog tuner** — drag the needle across up to 750 stations and the globe flies to each broadcaster | Radio Browser / broadcasters | 🟢 |
 | 🚲 **Bikeshare** | Live station availability | GBFS | 🟢 |
 | 🔥 **Active Fires** | Live NASA FIRMS detections, trailing 24h | NASA FIRMS | 🟡 |