Outage providers: licence-gated registry, ODIN adapter, /outages API, admin tab (Refs #184)

Part 1 of 2 for server-26#184 (map layer + incident cross-match follow in batch 3).

- app/internal/outages/: same gate as the camera registry -- settings doc
  config/outage_providers, every provider OFF by default, unreadable settings
  fail closed, stubs never enable, gated licences need acknowledge_licence
  stored with who/when plus an audit_log write as a precondition, and the
  acknowledgement is bound to the licence status it was given for.
  Reuses cameras.base Licence/LicenceInfo/get_json/safe_error/require_parsed.
- ODIN adapter (Licence.UNVERIFIED, gated): public county-level API verified
  first-hand against https://odin.ornl.gov/v3/api-docs -- /odi?format=JSON
  (counts, start, ETR), /odi/map?scale=COUNTY (county name, bbox, label
  point), /odi/status (utility freshness). Schema canary on all three.
  metersServed is utility-wide, so customers_served stays None.
- Stubs: poweroutage_us (paid), coned_oru / nyseg_rge / central_hudson
  storm centers and eagle_i_live (agreement required).
- GET /outages (signed-in) returns areas + per-provider credit/health and a
  status (ok / none_enabled / no_source / error) so an empty layer is never
  ambiguous. /admin/outage-providers GET + PUT, admin only, 409 with
  requires_acknowledgement like cameras.
- Frontend: c2api getOutages/listOutageProviders/setOutageProvider, types,
  Admin -> Outage providers tab (deep link /admin#outages).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

drb-frontend/lib/types.ts

@@ -217,6 +217,71 @@ export interface CameraProviderAdmin {
   health: { fetched_at: number | null; last_attempt_at: number | null; error: string | null; count: number } | null;
 }
 
+// Power outages (server-26#184) — GET /outages, cached server-side, not Firestore.
+/**
+ * One county with active outages from an enabled provider. `id` is
+ * provider-prefixed ("odin:36067"). Counts are utility-reported meters, used
+ * as customers. `lat`/`lon` is the centre of the county's bounding box — a
+ * label point, not an outage location. Times are ISO-8601 UTC.
+ */
+export interface OutageArea {
+  id: string;
+  provider: string;
+  fips: string;
+  county: string | null;
+  state: string | null;
+  customers_out: number;
+  customers_served: number | null;   // null: no county-level denominator from the source
+  etr: string | null;                // latest estimated restoration across the county's outages
+  since: string | null;              // earliest reported start
+  updated_at: string | null;         // newest time a reporting utility here last sent data
+  lat: number | null;
+  lon: number | null;
+  bbox: [number, number, number, number] | null;   // south, west, north, east
+  utilities: { name: string | null; eia_id: string | null; customers_out: number }[];
+}
+
+export interface OutageProviderFeed extends CameraCredit {
+  id: string;
+  name: string;
+  granularity: string;
+  coverage_note: string | null;
+  covers_bbox: boolean;
+  fetched_at: number | null;   // epoch s of the provider's last successful fetch
+  error: string | null;
+  total_in_bbox: number;
+  truncated: boolean;
+}
+
+export interface OutagesResponse {
+  areas: OutageArea[];
+  providers: OutageProviderFeed[];
+  serving_count: number;
+  /** Why the list is what it is — an empty layer is never ambiguous. */
+  status: "ok" | "none_enabled" | "no_source" | "error";
+  message: string | null;
+}
+
+/** Admin → Outage providers (GET /admin/outage-providers). */
+export interface OutageProviderAdmin {
+  id: string;
+  name: string;
+  region: string;
+  granularity: string;
+  implemented: boolean;
+  notes: string;
+  homepage: string | null;
+  licence: CameraProviderAdmin["licence"];
+  enabled: boolean;
+  serving: boolean;
+  not_serving_reason: string | null;
+  acknowledgement: CameraProviderAdmin["acknowledgement"];
+  updated_at: string | null;
+  updated_by: { uid: string; email: string } | null;
+  coverage_note: string | null;
+  health: CameraProviderAdmin["health"];
+}
+
 export interface Ny511Event {
   id: string;
   lat: number;