feat: AI 余额监控服务（平台/账号 CRUD、并发轮询、Telegram 阈值提醒）

config.json

@@ -0,0 +1,10 @@
+{
+  "port": 8000,
+  "password": "admin123",
+  "global_interval_seconds": 300,
+  "retry_count": 2,
+  "timeout_seconds": 10,
+  "max_workers": 8,
+  "telegram_bot_token": "",
+  "telegram_chat_id": ""
+}