feat(agents, config, dashboard, i18n): add agent line provision wizard, site deletion, and site dashboard with multi-language support

Added agent line provision wizard page with permission gating, replacing redirect placeholder. Introduced site deletion API and UI with confirmation dialog in integration sites management. Added new site-scoped dashboard panel showing bet metrics, P/L trends, active players, and quick links. Enhanced chart tooltip to support custom formatters and fix indicator color

src/i18n/locales/zh/agents.json

@@ -301,15 +301,12 @@
   },
   "lineProvision": {
     "title": "创建一级代理",
-    "description": "将一级代理绑定到已有接入站点，并配置后台登录账号与占成、授信、回水、结算周期。代理编码创建后不可修改。",
+    "description": "将一级代理绑定到已有接入站点，并配置后台登录账号与占成、授信、回水、结算周期。",
     "siteCode": "接入站点",
     "siteCodePlaceholder": "选择站点",
     "siteRequired": "请选择接入站点",
-    "codeRequired": "请填写代理编码",
-    "codePatternInvalid": "代理编码仅支持字母、数字、下划线和中划线，且需以字母或数字开头",
     "noUnboundSite": "暂无未绑定一级代理的站点",
     "openIntegrationSites": "前往接入站点",
-    "code": "代理编码",
     "name": "一级代理名称",
     "username": "后台登录账号",
     "password": "初始密码",