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/app/admin/page.tsx

@@ -4,6 +4,7 @@ import { useAuth } from "@/components/AuthProvider";
 import { c2api } from "@/lib/c2api";
 import { ReplayTab } from "@/components/admin/ReplayTab";
 import { CameraProvidersTab } from "@/components/admin/CameraProvidersTab";
+import { OutageProvidersTab } from "@/components/admin/OutageProvidersTab";
 import { useEffect, useState, useRef, useCallback } from "react";
 import { useRouter } from "next/navigation";
 import type { UserRecord, AuditEntry, UserRole, CallRecord } from "@/lib/types";
@@ -1268,11 +1269,12 @@ function SttEvalTab() {
 // Main admin page
 // ---------------------------------------------------------------------------
 
-type AdminTab = "features" | "cameras" | "correlation" | "replay" | "users" | "audit" | "calls" | "eval";
+type AdminTab = "features" | "cameras" | "outages" | "correlation" | "replay" | "users" | "audit" | "calls" | "eval";
 
 const TAB_LABELS: { key: AdminTab; label: string }[] = [
   { key: "features",    label: "AI Features" },
   { key: "cameras",     label: "Camera providers" },
+  { key: "outages",     label: "Outage providers" },
   { key: "correlation", label: "Correlation Debug" },
   { key: "replay",      label: "Replay" },
   { key: "calls",       label: "Calls" },
@@ -1285,7 +1287,7 @@ export default function AdminPage() {
   const { user, isAdmin, loading: authLoading } = useAuth();
   const router = useRouter();
   const [tab, setTab] = useState<AdminTab>("features");
-  // Deep link to a tab (/admin#cameras), e.g. from the live wall's empty state.
+  // Deep link to a tab (/admin#cameras, /admin#outages), e.g. from a map layer's empty state.
   useEffect(() => {
     const h = window.location.hash.slice(1);
     if (TAB_LABELS.some((t) => t.key === h)) setTab(h as AdminTab);
@@ -1304,7 +1306,7 @@ export default function AdminPage() {
   if (!isAdmin) return null;
 
   // Users/Audit tabs benefit from full width; everything else is narrow
-  const wide = tab === "users" || tab === "audit" || tab === "replay" || tab === "cameras";
+  const wide = tab === "users" || tab === "audit" || tab === "replay" || tab === "cameras" || tab === "outages";
 
   return (
     <div className={`space-y-6 ${wide ? "" : "max-w-2xl"}`}>
@@ -1326,6 +1328,7 @@ export default function AdminPage() {
 
       {tab === "features"    && <FeaturesTab />}
       {tab === "cameras"     && <CameraProvidersTab />}
+      {tab === "outages"     && <OutageProvidersTab />}
       {tab === "correlation" && <CorrelationDebugTab />}
       {tab === "replay"      && <ReplayTab />}
       {tab === "calls"       && <StaleCallsTab />}