Fix recorder finalize path and add invite-gated login

server/db.ts

@@ -82,7 +82,16 @@ export async function getUserByUsername(username: string) {
   return userResult.length > 0 ? userResult[0] : undefined;
 }
 
-export async function createUsernameAccount(username: string): Promise<{ user: typeof users.$inferSelect; isNew: boolean }> {
+export function isValidRegistrationInvite(inviteCode?: string | null) {
+  const expected = ENV.registrationInviteCode.trim();
+  if (!expected) return true;
+  return (inviteCode ?? "").trim() === expected;
+}
+
+export async function createUsernameAccount(
+  username: string,
+  inviteCode?: string,
+): Promise<{ user: typeof users.$inferSelect; isNew: boolean }> {
   const db = await getDb();
   if (!db) throw new Error("Database not available");
 
@@ -97,6 +106,10 @@ export async function createUsernameAccount(username: string): Promise<{ user: t
     }
   }
 
+  if (!isValidRegistrationInvite(inviteCode)) {
+    throw new Error("新用户注册需要正确的邀请码");
+  }
+
   // Create new user with username as openId
   const openId = `username_${username}_${Date.now()}`;
   await db.insert(users).values({