fix: dual-key rate limiting for auth + websocket reconnect guard

- Pass client IP (X-Real-IP header) through Flask to daemon for both
  password login and WebAuthn authenticate-finish endpoints
- Rate limiter now checks both IP and username buckets: IP layer catches
  enumeration/brute-force attacks across multiple usernames; username
  layer protects against single-account targeting from multiple IPs
- Add _wsRefreshing flag to prevent double-scheduling reconnect when
  onclose fires during token refresh; simplify async IIFE to .then()/.catch()
- Reset _wsRefreshing on websocket onopen for safety

webui/static/hoover/websocket.js

@@ -12,6 +12,7 @@ import { tryRefreshToken } from './api.js?v=12';
 let _wsConn = null;
 let _wsReconnectMs = 0;
 let _wsFailCount = 0;
+let _wsRefreshing = false;
 
 /** Direct onMessage handlers — { topics, handler, unsubscribed }[] */
 const _directHandlers = [];
@@ -44,28 +45,24 @@ function _wsConnect() {
     _wsConn.onopen = () => {
         _wsReconnectMs = 0;
         _wsFailCount = 0;
+        _wsRefreshing = false;
     };
 
     _wsConn.onclose = () => {
         if (!window.__auth_token__) return;
         _wsFailCount++;
 
-        if (_wsFailCount >= 3) {
-            // Attempt token refresh after repeated failures.  The reconnect
-            // is handled inside the IIFE to avoid double-scheduling when
-            // refresh succeeds.
-            (async () => {
-                const ok = await tryRefreshToken();
-                if (ok) {
-                    _wsFailCount = 0;
-                    _wsReconnectMs = 0;
-                    _wsConn = null;
-                    setTimeout(_wsConnect, 100);
-                } else {
-                    _wsReconnectMs = Math.min(_wsReconnectMs * 2 + 1000, 15000);
-                    setTimeout(_wsConnect, _wsReconnectMs);
-                }
-            })();
+        if (_wsFailCount >= 3 && !_wsRefreshing) {
+            _wsRefreshing = true;
+            tryRefreshToken().then(ok => {
+                _wsRefreshing = false;
+                _wsFailCount = 0;
+                _wsReconnectMs = 0;
+                _wsConn = null;
+                setTimeout(_wsConnect, 100);
+            }).catch(() => {
+                _wsRefreshing = false;
+            });
             return;
         }