docs: complete code-reality alignment for remaining docs + reconcile issue set

Remaining docs updated to match code (the docs that the first pass had not covered):
- Flows: Chat, Referral, Rating, Registration, Google OAuth, Negotiation, Payout,
  Trezor Safekeeping — corrected endpoints, socket events, status enums, auth gaps
- API Reference: User API, Trezor API — admin route prefix/verb/status corrections,
  added undocumented endpoints (ton-proof challenge, profile email verify,
  GET /trezor/account, POST /trezor/verify-operation)
- Data Models: Chat, Notification, Payment, PointTransaction, User — corrected
  enums (PaymentProvider, escrowState, PointTransaction.type, User.status),
  90-day notification TTL, soft-delete semantics, wallet fields

Trezor "zero frontend" finding (audit C31/C32) corrected as STALE:
- Verified current code HAS a full frontend Trezor implementation (admin/trezor
  page, TrezorSettingsView, trezorConnector via @trezor/connect-web,
  TrezorSignDialog, actions/trezor.ts building the {message,signature} object)
- Fixed Trezor Safekeeping Flow doc (removed false "no frontend" warnings)
- Reclassified ISSUE-012 as invalid/superseded with explanation

Issue set reconciled to a single canonical numbering (ISSUE-001..054):
- Adopted the comprehensive 51-issue set (long-slug, fully indexed)
- Removed 35 superseded short-slug duplicates from the first pass
- Removed a duplicate ISSUE-046 file
- Added 3 issues the 51-set lacked: ISSUE-052 (completed-not-counted-in-stats),
  ISSUE-053 (axios 401-only interceptor), ISSUE-054 (rate limiter counts all attempts)
- Regenerated Issues Index: 53 open (14 critical, 39 major) + 1 invalid

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

04 - Flows/Seller Offer Flow.md

@@ -136,7 +136,7 @@ sequenceDiagram
     end
     BE->>N: notifyNewOfferReceived
     N->>IO: emit notification to buyer
-    BE->>IO: emit seller new-offer
+    BE->>IO: emit new-offer to buyer-{buyerId}
     BE-->>FE_S: 200 { offer }
     IO-->>FE_B: notify buyer bell icon
     B->>FE_B: Open request detail
@@ -171,6 +171,7 @@ sequenceDiagram
 ## Socket events emitted
 
 - **`seller-offer-update`** with `eventType: 'new-offer'` → `seller-{sellerId}` (creator's other tabs).
+- **`new-offer`** → `buyer-{buyerId}` room — emitted directly by `marketplaceController.ts` on offer creation; `use-marketplace-socket.ts` (lines 300, 497) listens on this event to update the buyer's offer list in real time.
 - **`purchase-request-update`** with `eventType: 'offer-updated'` → `request-{requestId}` on edits (`SellerOfferService.ts:284-288`).
 - **`purchase-request-update`** → `request-{requestId}` when buyer calls `select-offer` (generic room event only — no per-seller notifications or events are sent to winning or losing sellers).
 - **`seller-offer-update`** with `eventType: 'payment-completed'` to winning seller, `'offer-rejected'` to losers (emitted by the webhook handler after payment confirmation).