feat: security hardening, DB indexes, token revocation, and input validation

- SSRF protection: DNS resolution + private IP blocking on metadata fetcher
- Upload security: CSP/X-Frame-Options headers, SVG forced download, nosniff
- Auth hardening: JWT secret min length, password min 8 chars, token revocation via password_changed_at
- Attachment ownership verification before linking to messages
- Message length limit (4000 chars) enforced on client and server
- Asset URL validation on avatar/banner updates
- Federation instance validation (domain regex, origin scheme, length limits)
- DB indexes on all FK columns for query performance
- Migrations: nullable moderator columns, dm_messages reply_to FK constraint
- File cleanup on avatar/banner replacement and space deletion
- Fastify trustProxy, AbortController on fetches, typing map size cap

packages/web/src/components/voice/VoiceControls.tsx

@@ -76,7 +76,7 @@ export function VoiceControls() {
   const handleDisconnect = () => {
     const { activeDmCall } = useVoiceStore.getState();
     if (activeDmCall) {
-      wsSend({ type: 'dm_call_end', dmChannelId: activeDmCall.dmChannelId }); // DM calls are home-only
+      wsSend({ type: 'dm_call_end', dmChannelId: activeDmCall.dmChannelId }, getChannelOrigin(activeDmCall.dmChannelId));
       useVoiceStore.getState().setActiveDmCall(null);
     } else {
       wsSend({ type: 'voice_leave' }, voiceOrigin);