feat(state_511_atis_cameras): Castle Rock 511 traffic cameras telemetry (v0.9.6)

New CENTRAL_TRAFFIC_CAMERAS stream + state_511_atis_cameras adapter. Telemetry
half of Castle Rock (events shipped in v0.9.2). Each Idaho camera -> one
telemetry event on /telemetry; detail drawer renders <img> direct from the
source (no blob storage / proxy in Central -- URL only).

supervisor + gui + ARCHIVE restart (NEW event-bearing stream
central.traffic_cameras.>). Ships disabled; public-unauth (no api key). Idaho only.

- Full camera list via POST /List/GetData/Cameras (DataTables), PAGINATED at
  100/page (Idaho ~455 = 5 pages). GetUserCameras was a red herring (4 default
  cams). The 100-row page cap also means v0.9.2 state_511_atis silently
  truncates its 114-row Construction layer -> separate v0.9.7 fix.
- Subject central.traffic_cameras.{state}.{camera_id}; category
  camera.state_511_atis_cameras -> GUI event_type "camera". data_class=telemetry.
- Per-UTC-day dedup {state}:cam:{id}:{YYYY-MM-DD}: one event per camera per day
  -- always shows today's cameras, no per-poll flooding, no retention
  coordination. Inherits the v0.9.1 dedup mixin.
- All sources included (Idaho511/ITDNET/RWIS/UDOT/ODOT/WYDOT/MTD border cameras);
  source surfaced in data + the drawer for provenance. WKT POINT (lon lat) -> geo.
- No upstream image-capture timestamp (lastUpdated is config-edit time); drawer
  shows no false "Captured" line. Cadence 600s. Severity 1 (telemetry).

Full suite: 829 passed, 1 skipped (central and unprivileged zvx, 3x each).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/test_events_feed_frontend.py

@@ -1146,6 +1146,7 @@ _SAMPLE_INNER = {
     "state_511_atis": {"layer": "Incidents", "roadway_name": "US-95", "location_description": "Ponderosa Mobile Home Park"},
     "tomtom_flow": {"road_category": "primary", "relative_speed": 0.11},
     "tomtom_incidents": {"description": "Roadworks", "from": "Early Road", "to": "Slade Road"},
+    "state_511_atis_cameras": {"location_description": "I-84 Mountain Home", "camera_id": 42},
 }
 
 # Exact expected subjects for the deterministic adapters. swpc_alerts is omitted
@@ -1167,6 +1168,7 @@ _EXPECTED_SUBJECT = {
     "wzdx": "Work zone on I-80 eastbound",
     "tomtom_flow": "Traffic flow (primary) — 11% of free-flow",
     "tomtom_incidents": "Roadworks on Early Road → Slade Road",
+    "state_511_atis_cameras": "Camera: I-84 Mountain Home",
 }