feat: implement federation for inter-instance meeting invitations with dedicated API, UI, and configuration.

server/config/database.js

@@ -179,6 +179,20 @@ export async function initDatabase() {
         value TEXT,
         updated_at TIMESTAMP DEFAULT NOW()
       );
+
+      CREATE TABLE IF NOT EXISTS federation_invitations (
+        id SERIAL PRIMARY KEY,
+        invite_id TEXT UNIQUE NOT NULL,
+        from_user TEXT NOT NULL,
+        to_user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+        room_name TEXT NOT NULL,
+        message TEXT,
+        join_url TEXT NOT NULL,
+        status TEXT DEFAULT 'pending' CHECK(status IN ('pending','accepted','declined')),
+        created_at TIMESTAMP DEFAULT NOW()
+      );
+      CREATE INDEX IF NOT EXISTS idx_fed_inv_to_user ON federation_invitations(to_user_id);
+      CREATE INDEX IF NOT EXISTS idx_fed_inv_invite_id ON federation_invitations(invite_id);
     `);
   } else {
     await db.exec(`
@@ -240,6 +254,22 @@ export async function initDatabase() {
         value TEXT,
         updated_at DATETIME DEFAULT CURRENT_TIMESTAMP
       );
+
+      CREATE TABLE IF NOT EXISTS federation_invitations (
+        id INTEGER PRIMARY KEY AUTOINCREMENT,
+        invite_id TEXT UNIQUE NOT NULL,
+        from_user TEXT NOT NULL,
+        to_user_id INTEGER NOT NULL,
+        room_name TEXT NOT NULL,
+        message TEXT,
+        join_url TEXT NOT NULL,
+        status TEXT DEFAULT 'pending' CHECK(status IN ('pending','accepted','declined')),
+        created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+        FOREIGN KEY (to_user_id) REFERENCES users(id) ON DELETE CASCADE
+      );
+
+      CREATE INDEX IF NOT EXISTS idx_fed_inv_to_user ON federation_invitations(to_user_id);
+      CREATE INDEX IF NOT EXISTS idx_fed_inv_invite_id ON federation_invitations(invite_id);
     `);
   }