VPN connection log: who connected and when

WireGuard has no connect events, only the last handshake and byte counters.
awg-ctrl now checks them every 30 s and writes conn_log in users.db: connect
at the first handshake, disconnect at the last activity (the last tick the
counters moved), with the session length and traffic, plus peer_seen, the
last time each peer was online. Open sessions are restored from the database,
so a restart adds no duplicates; a down interface is not a disconnect; a peer
removed mid-session is closed. Events keep the name, owner and VPN IP as of
that moment and live 90 days. Client public IPs are not recorded.

GET /api/connlog serves the events and the per-peer last-seen list. The panel
fetches it from the selected server at /ui/connlog and fills in master key
labels and device names for sen:// peers. A new "Подключения" tab shows the
event feed with search and paging, and "who was online when", including
those who never connected.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013bNGYiDst62wH3ZGTRPFLJ

awg-ui/src/components/icons.tsx

@@ -108,10 +108,17 @@ export const IcoMove = () => (
     </svg>
 );
 
+export const IcoHistory = () => (
+    <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
+        <path d="M3 12a9 9 0 1 0 3-6.7L3 8"/><path d="M3 3v5h5"/><path d="M12 7v5l3 2"/>
+    </svg>
+);
+
 export const ICONS: Record<string, () => JSX.Element> = {
     users: IcoUsers,
     key:   IcoKey,
     shield: IcoShield,
     pulse:  IcoPulse,
     move:   IcoMove,
+    history: IcoHistory,
 };