fix(cctv): leave Iceland to its own pack, credit World and Canada packs

Main now ships an Iceland pack that loads the full live Vegagerðin list
(about 500 views) with its CC BY 4.0 credit. The World catalog's 166
Vegagerðin rows point at the same frames under different ids, so every one
of those cameras would be drawn twice. Drop them from the World export and
its loader policy; World is now 2,230 rows and the default catalog limit
7,350 (4,000 shared slots plus 3,350 reserved).

Register Data attribution entries for Ottawa, Québec, TripCheck and MLIT,
as every other CCTV pack has. MLIT's terms ask for the source in the form
"出典：国土交通省 川の防災情報" with the page link, and ODOT asks for
"Camera courtesy of ODOT"; TripCheck partner cameras keep their owner's
name in the label.

The Houston guard test from main checked the old 4,000 default ceiling;
check the 4,000 shared slots instead, like the other pack tests.

DATA_SOURCES.md

@@ -173,7 +173,7 @@ The optional Local ADS-B layer and the broadcast-FM receiver use radio you recei
 - **Fintraffic weathercams.** The camera list is one keyless GeoJSON request to `tie.digitraffic.fi/api/weathercam/v1/stations` (809 stations / 2,275 presets), sent with the `Digitraffic-User: gods-eye-view` header the service asks clients to identify themselves with and with gzip; frames are stills on `weathercam.digitraffic.fi`, refreshed on each station's 600 s collection interval, which is also the client's ambient-still refresh cadence for this pack (the active camera keeps the usual 10-second refresh). One preset (a fixed camera view) is one camera; stations not `GATHERING` and presets not `inCollection` are dropped. Attribution is required by the CC BY 4.0 licence and is registered in the Data attribution popover. `CCTV_FINTRAFFIC_ENABLED=0` is the kill switch.
 - **DriveBC highway cameras.** The camera list comes from the keyless `https://www.drivebc.ca/api/webcams/` endpoint served by the DriveBC.ca site ([bcgov/DriveBC.ca](https://github.com/bcgov/DriveBC.ca)); frames come from `https://www.drivebc.ca/images/<id>.jpg`, built from the numeric camera id. DataBC's [DriveBC HighwayCams](https://catalogue.data.gov.bc.ca/dataset/bc-highwaycams) catalogue entry publishes the same cameras under the Open Government Licence – British Columbia, but its CSV still lists the retired `images.drivebc.ca` frame URLs, which now return a placeholder. The licence's attribution statement is required and is registered in the Data attribution popover. By default the 250 cameras nearest Vancouver and Victoria load; `CCTV_DRIVEBC_MAX_SOURCES` changes the cap and `CCTV_DRIVEBC_ENABLED=0` turns the pack off. Some cameras in the feed are supplied by partners (TransLink, the City of Vancouver, the City of Surrey, Parks Canada / Alberta Motor Association and others); the feed's per-camera credit is carried onto the camera record and shown beside the provider in the CCTV panel.
 - **City of Ottawa traffic cameras.** Camera images come from the city's [Traffic Camera Images API](https://traffic.ottawa.ca/en/traffic-map-data-lists-and-resources/about-the-data), which requires an access certificate requested through the city's registration form and allows one certificate and user id to fetch a camera at most once every 60 seconds. Set `OTTAWA_CAMERA_CERTIFICATE`; without it the pack is skipped and makes no request. The camera list is the documented keyless `traffic.ottawa.ca/map/service/camera` JSON (camera number, English and French names, coordinates, owner). Frames are `traffic.ottawa.ca/opendata/camera?c=<number>`; the server adds the certificate and the user id `gev` at fetch time, so no catalog response carries the key, and serves each camera from one shared in-memory frame per minute. MTO cameras carried on the city feed keep their owner as a per-camera credit. The feed publishes no bearing, so headings use the shared id-hash fallback at low confidence, and no status field, so a camera the city takes offline still registers. Frames are never stored on disk. The city states no redistribution licence for the images; the certificate request asks how they will be used, so describe the deployment there. `CCTV_OTTAWA_MAX_SOURCES` caps the pack (default 250, nearest downtown) and `CCTV_OTTAWA_ENABLED=0` turns it off.
-- **World cams image subset.** The normal CCTV catalog adds 166 Icelandic Road and Coastal Administration cameras, 1,176 Oregon TripCheck stills, and 1,054 MLIT river cameras from the curated `config/cctv_sources.world-image-cameras.json` export; disable it with `CCTV_WORLD_CAMERAS_ENABLED=0`. The server validates and pins each image URL to its provider path. [Vegagerðin's data-service licence](https://www.vegagerdin.is/vegagerdin/gagnasafn/vefthjonustur/terms-and-conditions) permits reuse with attribution but excludes third-party rights; [ODOT allows TripCheck image use and requests credit](https://www.tripcheck.com/Pages/Frequently-Asked-Questions); MLIT's [site terms](https://www.river.go.jp/kawabou/kwb_apend/html/caution.html) are CC BY-compatible with attribution and warn against high-volume/periodic collection, so those frames refresh at ten minutes per camera. Images are not bundled or persisted; a bounded 32 MB in-memory cache reuses them until the per-source cadence. The 249 NZTA Journey Planner rows are excluded because its [website terms prohibit scraping](https://www.journeys.nzta.govt.nz/about-this-site/terms-of-use); use an authorized API feed or obtain permission before adding those rows.
+- **World cams image subset.** The normal CCTV catalog adds 1,176 Oregon TripCheck stills and 1,054 MLIT river cameras from the curated `config/cctv_sources.world-image-cameras.json` export; disable it with `CCTV_WORLD_CAMERAS_ENABLED=0`. The export's Vegagerðin rows are left out because the Iceland pack already loads those cameras. The server validates and pins each image URL to its provider path, fetches a frame only when a camera is viewed, and never stores or redistributes it. [ODOT allows businesses, private citizens and organizations to use TripCheck images and asks for credit](https://www.tripcheck.com/Pages/Frequently-Asked-Questions) ("Camera courtesy of ODOT"); TripCheck also carries partner cameras run by Oregon counties and cities, Caltrans and WSDOT, which keep their owner's name in the camera label. MLIT's [site terms](https://www.river.go.jp/kawabou/kwb_apend/html/caution.html) follow the Government of Japan Standard Terms of Use 2.0 (CC BY 4.0 compatible, commercial use allowed, source credit required) and ask tools not to collect data periodically, pointing regular collection to the river information data service; frames are therefore fetched only on view and refresh at most every ten minutes per camera. Both credits are registered in the Data attribution popover.
 - **TxDOT ITS cameras.** The catalog comes from the keyless `its.txdot.gov/its/DistrictIts/GetCctvStatusListByDistrict` endpoint, one call per district. Frames come from the per-camera `GetCctvSnapshotByIcdId` endpoint, which answers JSON carrying a base64 JPEG rather than an image body; the proxy decodes it only for responses from the official TxDOT origin and validates the JPEG header before serving. Only cameras reporting `Device Online` are registered. Districts default to Austin and San Antonio (`CCTV_TXDOT_DISTRICTS`; 25 codes exist statewide); `CCTV_TXDOT_MAX_SOURCES` caps the pack and `CCTV_TXDOT_ENABLED=0` turns it off. Frames are fetched live at request time and are never stored or redistributed.
 - **Tallinn ristmikud.** Intersection camera stills are fetched live from `ristmikud.tallinn.ee` (`/last/camNNN.jpg`). The curated catalog (`config/cctv_sources.tallinn.json`) supplies coordinates and heading priors; only server-registered ristmikud HTTPS URLs are proxied. Frames are fetched at request time and never stored or redistributed. Disable with `CCTV_TALLINN_ENABLED=0`.
 - **Tarktee / Transpordiamet.** Estonia road-weather camera locations and current JPEG URLs come from keyless DATEX2 endpoints on `tarktee.transpordiamet.ee` (`/api/v1/datex/roadCameraLocations` + `roadCameraImages`). Frame URLs rotate with each capture; the 15-minute CCTV source cache refreshes them. Only `https://tarktee.transpordiamet.ee/images/…` URLs are registered. Disable with `CCTV_TARKTEE_ENABLED=0`.
@@ -226,7 +226,7 @@ The [Bhote Koshi event pack](public/events/bhote-koshi-2026/README.md), under `p
 | **Dams** (704) | `dams/` | **ODbL 1.0** (OpenInfraMap / OSM extract) | ✅ (attribution + share-alike on data) | © OpenStreetMap contributors (shared credit) + Open Infrastructure Map |
 | **Military area names** (36,466) | `osm_military_names/` | **ODbL 1.0** (OpenStreetMap, via Overture Maps) | ✅ (attribution + share-alike on data) | © OpenStreetMap contributors (shared credit) + Overture Maps Foundation |
 | **Québec CCTV source catalog** (1,120 locations) | `public/quebec-cameras.json` | Mixed: MTQ locations CC BY 4.0; Montréal camera nodes ODbL 1.0; scenic records retain per-record provenance. No video files are bundled or cached. | Location data is per-record; video remains hosted by Québec 511 and its platform terms apply; scenic source pages may have separate terms | MTQ / Données Québec CC BY 4.0; © OpenStreetMap contributors (ODbL); scenic operator and position source shown in the selected-camera panel |
-| **World camera image subset** (2,396 locations) | `config/cctv_sources.world-image-cameras.json` | Mixed: Vegagerðin open-government licence, ODOT TripCheck public images, and MLIT site content compatible with CC BY 4.0. Frames are not bundled or persisted; the server holds a bounded in-memory cache. | Per-source terms apply; NZTA Journey Planner web-cache rows are excluded | Vegagerðin, Oregon Department of Transportation, and Japan Ministry of Land, Infrastructure, Transport and Tourism (MLIT) |
+| **World camera image subset** (2,230 locations) | `config/cctv_sources.world-image-cameras.json` | Mixed: ODOT TripCheck public images (ODOT permits use with credit) and MLIT site content under terms compatible with CC BY 4.0. Frames are not bundled or persisted; the server holds a bounded in-memory cache. | Per-source terms apply; NZTA Journey Planner web-cache rows are excluded; Vegagerðin rows are served by the Iceland pack instead | Oregon Department of Transportation (Camera courtesy of ODOT) and Japan Ministry of Land, Infrastructure, Transport and Tourism (出典：国土交通省 川の防災情報) |
 | **TeleGeography Submarine Cable Map** (712 cables + 1,917 landing points)   | `telegeography_submarine_cables/` | **CC BY-NC-SA 3.0**                                                                                       | ❌ **NonCommercial — remove for commercial use** | "© TeleGeography — submarinecablemap.com"                                   |
 | **Natural Earth physical regions** (1,046 land + 292 marine named polygons) | `natural_earth/`                  | **Public domain**                                                                                         | ✅ (no restrictions)                             | "Made with Natural Earth" (courtesy credit — not legally required)          |
 | **DataSF Analysis Neighborhoods** (41 SF neighborhood polygons)             | `neighborhoods/`                  | **PDDL 1.0** (public domain)                                                                              | ✅ (no restrictions)                             | "City & County of San Francisco — DataSF" (courtesy — not legally required) |