Add AWG_GEN/AWG_PIN switches and surface module version

Upstream AmneziaWG 3.x is still shifting under active development
(unanswered kernel-module issues around header protection and
handshake-without-data regressions), so give operators an explicit
opt-out/opt-in instead of always auto-selecting 3.1, and pin the
installed package so unattended-upgrades can't swap the module under
a live server. Surface the running module/tools version and protocol
generation through /health, the CLI status command, and the panel's
server card so a mismatch is visible instead of silent.

awg-ui/src/App.tsx

@@ -36,7 +36,10 @@ export default function App() {
     // вкладок (юзеры, ключи) грузят сами вкладки.
     const startSession = useCallback(async (tok: string) => {
         const { data: h } = await axios.get('/health', { headers: { Authorization: `Bearer ${tok}` } });
-        setServerInfo({ name: h.server || 'VPN', ip: h.ip || '', peers: h.awg?.peers ?? 0, gen: h.gen || '2' });
+        setServerInfo({
+            name: h.server || 'VPN', ip: h.ip || '', peers: h.awg?.peers ?? 0, gen: h.gen || '2',
+            mod: h.awg?.module ?? '', tools: h.awg?.tools ?? '',
+        });
         setStatusText('online:' + (h.server || 'ok') + ' · peers: ' + (h.awg?.peers ?? '?'));
     }, []);