Merge branch 'main' into test

backend/migrations/042b_add_ops_system_metrics_switch_count.sql

+-- ops_system_metrics 增加账号切换次数统计（按分钟窗口）
+ALTER TABLE ops_system_metrics
+    ADD COLUMN IF NOT EXISTS account_switch_count BIGINT NOT NULL DEFAULT 0;

backend/migrations/044b_add_group_mcp_xml_inject.sql

+-- Add mcp_xml_inject field to groups table (for antigravity platform)
+ALTER TABLE groups ADD COLUMN mcp_xml_inject BOOLEAN NOT NULL DEFAULT true;