Extract memind_adm admin server, add local dev tooling, and remove image-generation.

Split platform admin and ops APIs into standalone admin-server.mjs with network guards; simplify billing to RMB token pricing, refactor user auth, and add rsync deploy plus local-test scripts and docs.

Co-authored-by: Cursor <cursoragent@cursor.com>

db.mjs

@@ -255,12 +255,6 @@ export async function migrateSchema(pool) {
     `ALTER TABLE h5_payment_orders
      MODIFY pay_mode ENUM('native', 'h5', 'jsapi') NOT NULL DEFAULT 'native'`,
   );
-
-  if (!(await indexExists(pool, 'h5_usage_records', 'idx_h5_usage_created'))) {
-    await pool.query(
-      `ALTER TABLE h5_usage_records ADD KEY idx_h5_usage_created (created_at)`,
-    );
-  }
 }
 
 export async function initSchema(pool) {