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fix(cctv): add Taiwan Highway Bureau fallback

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docs/CURRENT-STATE.md
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@@ -1341,24 +1341,8 @@ video; camera poses use the existing low-confidence heading prior.
## Taiwan CCTV source pack
The CCTV catalog includes Taiwan national freeway cameras from the Freeway
Bureau, MOTC. One keyless request reads the daily MOTC 2.0 `CCTV.xml` table
(~1,800 cameras); the request refuses redirects, has a 15-second deadline and a
6 MiB response cap, and uses the shared 15-minute cache and fair catalog
allocation. A failed download serves the last good table (up to a day old),
or an empty pack, and is not retried for an hour: the catalog host does not
answer from some networks outside Taiwan, and without the backoff every refresh
there would wait out the connect timeout. The table
publishes MJPEG stream URLs; each is mapped to the same camera server's
single-JPEG path for the same camera number, and only those exact HTTPS pairs
on the four `freeway.gov.tw` camera servers are registered with the frame
proxy. Camera keys come from the server and camera number, because published
CCTV IDs contain Chinese place names and a few repeat across cameras. Poses use
the low-confidence heading prior. `CCTV_TAIWAN_ENABLED=0` disables the pack;
`CCTV_TAIWAN_MAX_SOURCES` sets its cap (default 600, bounded to 1–2000), and
`CCTV_TAIWAN_URL` overrides the table URL.
Gate: `src/data/cctvTaiwan.test.mjs`.
The CCTV catalog includes Taiwan national freeway cameras from the Freeway Bureau, MOTC. The app first reads the daily MOTC 2.0 CCTV.xml table with a keyless HTTPS request, a 15-second deadline, a 6 MiB response cap, and the shared 15-minute cache. If that catalog is unreachable and no last-good source list exists, the loader uses the Highway Bureau’s public provincial-road CCTV XML feed at https://cctv-maintain.thb.gov.tw/opendataCCTVs.xml. The fallback is capped by the same Taiwan source limit and hourly retry backoff; its MJPEG feeds are restricted to the eight cctv-ss01 through cctv-ss08.thb.gov.tw HTTPS servers. The frame proxy returns one bounded JPEG from each stream, not an unbounded video response. The Highway Bureau open-data page states XML downloads are free and asks users to attribute the source; the app credits Highway Bureau, MOTC. These are provincial-road cameras, not a replacement for the national freeway cameras. CCTV_TAIWAN_ENABLED=0 disables both feeds; CCTV_TAIWAN_MAX_SOURCES sets the shared cap (default 600, bounded to 1–2000), and CCTV_TAIWAN_URL overrides the Freeway Bureau table URL.
Gate: src/data/cctvTaiwan.test.mjs and src/data/cctvProxy.test.mjs.
## DriveBC CCTV source pack
The CCTV catalog adds DriveBC highway cameras for British Columbia alongside the