feat(group): 添加 MCP XML 注入开关

- Group 新增 mcp_xml_inject 字段，控制 Antigravity 平台的 MCP XML 协议注入
- 默认启用，可在分组设置中关闭
- 修复 GetByKeyForAuth 遗漏查询 mcp_xml_inject 字段导致认证缓存值始终为 false 的问题

backend/ent/group_update.go

@@ -448,6 +448,20 @@ func (_u *GroupUpdate) SetNillableModelRoutingEnabled(v *bool) *GroupUpdate {
 	return _u
 }
 
+// SetMcpXMLInject sets the "mcp_xml_inject" field.
+func (_u *GroupUpdate) SetMcpXMLInject(v bool) *GroupUpdate {
+	_u.mutation.SetMcpXMLInject(v)
+	return _u
+}
+
+// SetNillableMcpXMLInject sets the "mcp_xml_inject" field if the given value is not nil.
+func (_u *GroupUpdate) SetNillableMcpXMLInject(v *bool) *GroupUpdate {
+	if v != nil {
+		_u.SetMcpXMLInject(*v)
+	}
+	return _u
+}
+
 // AddAPIKeyIDs adds the "api_keys" edge to the APIKey entity by IDs.
 func (_u *GroupUpdate) AddAPIKeyIDs(ids ...int64) *GroupUpdate {
 	_u.mutation.AddAPIKeyIDs(ids...)
@@ -874,6 +888,9 @@ func (_u *GroupUpdate) sqlSave(ctx context.Context) (_node int, err error) {
 	if value, ok := _u.mutation.ModelRoutingEnabled(); ok {
 		_spec.SetField(group.FieldModelRoutingEnabled, field.TypeBool, value)
 	}
+	if value, ok := _u.mutation.McpXMLInject(); ok {
+		_spec.SetField(group.FieldMcpXMLInject, field.TypeBool, value)
+	}
 	if _u.mutation.APIKeysCleared() {
 		edge := &sqlgraph.EdgeSpec{
 			Rel:     sqlgraph.O2M,
@@ -1602,6 +1619,20 @@ func (_u *GroupUpdateOne) SetNillableModelRoutingEnabled(v *bool) *GroupUpdateOn
 	return _u
 }
 
+// SetMcpXMLInject sets the "mcp_xml_inject" field.
+func (_u *GroupUpdateOne) SetMcpXMLInject(v bool) *GroupUpdateOne {
+	_u.mutation.SetMcpXMLInject(v)
+	return _u
+}
+
+// SetNillableMcpXMLInject sets the "mcp_xml_inject" field if the given value is not nil.
+func (_u *GroupUpdateOne) SetNillableMcpXMLInject(v *bool) *GroupUpdateOne {
+	if v != nil {
+		_u.SetMcpXMLInject(*v)
+	}
+	return _u
+}
+
 // AddAPIKeyIDs adds the "api_keys" edge to the APIKey entity by IDs.
 func (_u *GroupUpdateOne) AddAPIKeyIDs(ids ...int64) *GroupUpdateOne {
 	_u.mutation.AddAPIKeyIDs(ids...)
@@ -2058,6 +2089,9 @@ func (_u *GroupUpdateOne) sqlSave(ctx context.Context) (_node *Group, err error)
 	if value, ok := _u.mutation.ModelRoutingEnabled(); ok {
 		_spec.SetField(group.FieldModelRoutingEnabled, field.TypeBool, value)
 	}
+	if value, ok := _u.mutation.McpXMLInject(); ok {
+		_spec.SetField(group.FieldMcpXMLInject, field.TypeBool, value)
+	}
 	if _u.mutation.APIKeysCleared() {
 		edge := &sqlgraph.EdgeSpec{
 			Rel:     sqlgraph.O2M,