fix(plugins): per-tenant plugin store flag and harden broken schema APIs

Store enablement is now a tenant settings row instead of a global runtime switch, and expiring/requests endpoints degrade to empty lists when store tables are missing.

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

src/program-settings/runtime-setting-keys.ts

@@ -1,4 +1,6 @@
 /** کلیدهای runtime / لاگ — مال سوپرادمین نیستند؛ در اپ خانگی توسط cron پر می‌شوند. */
+export const PLUGIN_STORE_SETTING_KEY = 'plugin_store_enabled';
+
 export const RUNTIME_PROGRAM_SETTING_KEYS = new Set([
   'montzar_last_product_log',
   'montzar_order_response',
@@ -13,6 +15,7 @@ export const RUNTIME_PROGRAM_SETTING_KEYS = new Set([
   'down_price',
   'price_extreme_date',
   'do_send_liman',
+  PLUGIN_STORE_SETTING_KEY,
 ]);
 
 export function isRuntimeProgramSettingKey(keyRaw: string): boolean {