Merge origin/master (TURN/coturn + BizGaze-only login) into feature tree

Resolved conflicts in routes.js and share.html: kept the dev tree's superset
(ALLOW_LOCAL_LOGIN dev escape, avatar sync, richer login errors) which already
includes the incoming production BizGaze-only behavior; took the more descriptive
incoming comments. Restored 5 untracked modules (chat, calls, directory,
reminders, webhooks) that were missing from disk — required by routes/signaling.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

server/reminders.js

@@ -0,0 +1,25 @@
+// Fires a one-shot "starts in ~10 minutes" reminder to a scheduled meeting's host,
+// group members, and invited participants. Runs on a 60s tick; marks each meeting reminded.
+const R = require('./repos');
+const CHAT = require('./chat');
+
+function tick() {
+  try {
+    const now = Date.now();
+    const due = R.scheduledMeetings.dueForReminder(now, now + 10 * 60 * 1000); // starting within 10 min
+    for (const s of due) {
+      const recipients = new Set([s.created_by]);
+      let invited = []; try { invited = JSON.parse(s.participants || '[]'); } catch (_) {}
+      invited.forEach((id) => recipients.add(id));
+      if (s.group_id) { try { R.conversations.members(s.group_id).forEach((m) => recipients.add(m)); } catch (_) {} }
+      const evt = { type: 'meeting-reminder', meeting: { id: s.id, title: s.title, scheduledAt: s.scheduled_at, room: s.room_code } };
+      recipients.forEach((uid) => { try { CHAT.pushToUser(uid, evt); } catch (_) {} });
+      R.scheduledMeetings.markReminded(s.id);
+    }
+  } catch (_) { /* never let the timer die */ }
+}
+
+let timer = null;
+function start() { if (!timer) timer = setInterval(tick, 60 * 1000); }
+start();
+module.exports = { start, tick };