feat: P2.9 VNCtalk + P2.10 Collabora + P2.11 Calendar Enhancements + P2.13 VNCdirectory Admin

- P2.9: VNCtalk video meeting — create/update meeting from event modal,
  'Join Meeting' link in event detail. Admin config vnctalkServerUrl.
- P2.10: Collabora online editing — 'Edit with Collabora' for office files,
  WOPI discovery + edit URL. Admin config collaboraServerUrl.
- P2.11: Calendar enhancements — clickable links in descriptions,
  participant contact popover, Reply/Reply All from event, timezone picker,
  map links for locations.
- P2.13: VNCdirectory IDP admin panel — Connection, SAML/IDP, LDAP,
  Authentication, Federated Apps configuration. Secret masking on display.

app/api/collabora/edit/route.ts

@@ -0,0 +1,32 @@
+import { NextRequest, NextResponse } from "next/server";
+import { getCollaboraEditUrl } from "@/lib/collabora/client";
+import { logger } from "@/lib/logger";
+
+export async function POST(request: NextRequest) {
+  try {
+    const body = await request.json();
+
+    if (!body.fileId || !body.fileName) {
+      return NextResponse.json(
+        { error: "Missing required fields: fileId, fileName" },
+        { status: 400 }
+      );
+    }
+
+    const url = await getCollaboraEditUrl(
+      String(body.fileId),
+      String(body.fileName)
+    );
+
+    return NextResponse.json({ url });
+  } catch (error) {
+    const message = error instanceof Error ? error.message : "Unknown error";
+    logger.error("Collabora edit URL failed", { error: message });
+
+    if (message.includes("not configured")) {
+      return NextResponse.json({ error: message }, { status: 503 });
+    }
+
+    return NextResponse.json({ error: message }, { status: 500 });
+  }
+}