feat(07.1): session revocation on privilege change — CR-01/CR-02/CR-03

- revoke_all_refresh_tokens: add skip_token_hash optional param (exclude
  current session while revoking others)
- change_password, enable_totp, disable_totp: call revoke with skip hash
  derived from refresh cookie; return sessions_revoked in response and
  write to audit log metadata_
- 3 new tests: test_{change_password,enable_totp,disable_totp}_revokes_other_sessions
  — all PASSED; 373 total passing, 0 regressions
- Frontend toasts: SettingsAccountTab + TotpEnrollment show
  "Other sessions have been terminated." when sessions_revoked > 0
- Companion fixes: rate_limiting get_client_ip refactor, deps/auth.py
  request.state.current_user, locustfile refresh-token task removal
- Version bump: 0.1.0 → 0.1.1

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/services/rate_limiting.py

@@ -4,14 +4,15 @@ from __future__ import annotations
 from fastapi import Request
 from slowapi import Limiter
 
+from deps.utils import get_client_ip
+
 
 def _account_key(request: Request) -> str:
     user = getattr(request.state, "current_user", None)
     if user is not None:
         return str(user.id)
-    if request.client:
-        return request.client.host
-    return "anonymous"
+    ip = get_client_ip(request)
+    return ip if ip is not None else "anonymous"
 
 
 account_limiter = Limiter(key_func=_account_key)