docs: master API surface list, all 86 frontend endpoints in one doc

Generated directly from source (every this.http.get/post/patch/put/delete
call across core/, features/admin/, api.service.ts) rather than written
from memory - a census, not a design doc.

47 already match an existing Phase/Track contract exactly. 24 are inferred
from this codebase's own REST conventions with no contract doc stating them
- each flagged in source at its call site, not just in this doc, so backend
sees the reasoning next to the code. 15 are legacy endpoints
(/category, /cart, /qr, /websession, ...) with no contract anywhere,
still live today.

Biggest concrete gap surfaced: three full admin domains (transactions,
monitoring, moderation) have real UI and real gateways calling
/api/admin/v2/{resource} by convention, with zero backend contract written
for any of them.

One real bug found and fixed while building this, not just flagged:
connector-api.gateway.ts's replay() called
POST /api/admin/v2/integrations/dead-letter/{id}/replay, omitting the
{connectorId} segment the contract's own path requires
(PHASE-4-CONNECTOR-FRAMEWORK-CONTRACT.md §7). Fixed the interface, both
gateway implementations, and the doc entry in the same pass - no callers
existed yet, so this shipped without ever being exercised by a UI.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/app/core/integrations/services/connector-api.gateway.ts

@@ -23,9 +23,12 @@ export class ConnectorApiGateway implements ConnectorGateway {
     );
   }
 
-  replay(deadLetterId: string): Observable<void> {
+  replay(connectorId: string, deadLetterId: string): Observable<void> {
     return this.http
-      .post(`/api/admin/v2/integrations/dead-letter/${encodeURIComponent(deadLetterId)}/replay`, {})
+      .post(
+        `/api/admin/v2/integrations/${encodeURIComponent(connectorId)}/dead-letter/${encodeURIComponent(deadLetterId)}/replay`,
+        {},
+      )
       .pipe(map(() => undefined));
   }
 

src/app/core/integrations/services/connector-gateway.interface.ts

@@ -4,7 +4,7 @@ import { Connector, DeadLetterEntry } from '../models/connector.model';
 export interface ConnectorGateway {
   loadConnectors(): Observable<Connector[]>;
   loadDeadLetter(connectorId: string): Observable<DeadLetterEntry[]>;
-  replay(deadLetterId: string): Observable<void>;
+  replay(connectorId: string, deadLetterId: string): Observable<void>;
   pause(connectorId: string): Observable<void>;
   resume(connectorId: string): Observable<void>;
 }

src/app/core/integrations/services/connector-local.gateway.ts

@@ -21,7 +21,7 @@ export class ConnectorLocalGateway implements ConnectorGateway {
     return of([]);
   }
 
-  replay(_deadLetterId: string): Observable<void> {
+  replay(_connectorId: string, _deadLetterId: string): Observable<void> {
     return of(void 0);
   }