feat: 增强 webhook 通知功能，支持手动禁用账号通知

- 添加手动禁用账号时的 webhook 通知功能
- 支持所有账号类型：Claude OAuth、Claude Console、Gemini
- 新增错误代码：MANUALLY_DISABLED 系列
- 更新 README.md 文档，添加完整的 webhook 配置说明
- 包含企业微信配置示例和测试方法

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/services/geminiAccountService.js

@@ -455,6 +455,23 @@ async function updateAccount(accountId, updates) {
     }
   }
 
+  // 检查是否手动禁用了账号，如果是则发送webhook通知
+  if (updates.isActive === 'false' && existingAccount.isActive !== 'false') {
+    try {
+      const webhookNotifier = require('../utils/webhookNotifier')
+      await webhookNotifier.sendAccountAnomalyNotification({
+        accountId,
+        accountName: updates.name || existingAccount.name || 'Unknown Account',
+        platform: 'gemini',
+        status: 'disabled',
+        errorCode: 'GEMINI_MANUALLY_DISABLED',
+        reason: 'Account manually disabled by administrator'
+      })
+    } catch (webhookError) {
+      logger.error('Failed to send webhook notification for manual account disable:', webhookError)
+    }
+  }
+
   await client.hset(`${GEMINI_ACCOUNT_KEY_PREFIX}${accountId}`, updates)
 
   logger.info(`Updated Gemini account: ${accountId}`)