feat(group-filter): 分组账号过滤控制 — require_oauth_only + require_privacy_set

为 OpenAI/Antigravity/Anthropic/Gemini 分组新增两个布尔控制字段：
- require_oauth_only: 创建/更新账号绑定分组时拒绝 apikey 类型加入
- require_privacy_set: 调度选号时跳过 privacy 未成功设置的账号并标记 error

后端：Ent schema 新增字段 + 迁移、Group CRUD 全链路透传、
      gateway_service 与 openai_account_scheduler 两套调度路径过滤
前端：创建/编辑表单 toggle 开关（OpenAI/Antigravity/Anthropic/Gemini 平台可见）

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/ent/group/group.go

@@ -77,6 +77,10 @@ const (
 	FieldSortOrder = "sort_order"
 	// FieldAllowMessagesDispatch holds the string denoting the allow_messages_dispatch field in the database.
 	FieldAllowMessagesDispatch = "allow_messages_dispatch"
+	// FieldRequireOauthOnly holds the string denoting the require_oauth_only field in the database.
+	FieldRequireOauthOnly = "require_oauth_only"
+	// FieldRequirePrivacySet holds the string denoting the require_privacy_set field in the database.
+	FieldRequirePrivacySet = "require_privacy_set"
 	// FieldDefaultMappedModel holds the string denoting the default_mapped_model field in the database.
 	FieldDefaultMappedModel = "default_mapped_model"
 	// EdgeAPIKeys holds the string denoting the api_keys edge name in mutations.
@@ -185,6 +189,8 @@ var Columns = []string{
 	FieldSupportedModelScopes,
 	FieldSortOrder,
 	FieldAllowMessagesDispatch,
+	FieldRequireOauthOnly,
+	FieldRequirePrivacySet,
 	FieldDefaultMappedModel,
 }
 
@@ -255,6 +261,10 @@ var (
 	DefaultSortOrder int
 	// DefaultAllowMessagesDispatch holds the default value on creation for the "allow_messages_dispatch" field.
 	DefaultAllowMessagesDispatch bool
+	// DefaultRequireOauthOnly holds the default value on creation for the "require_oauth_only" field.
+	DefaultRequireOauthOnly bool
+	// DefaultRequirePrivacySet holds the default value on creation for the "require_privacy_set" field.
+	DefaultRequirePrivacySet bool
 	// DefaultDefaultMappedModel holds the default value on creation for the "default_mapped_model" field.
 	DefaultDefaultMappedModel string
 	// DefaultMappedModelValidator is a validator for the "default_mapped_model" field. It is called by the builders before save.
@@ -414,6 +424,16 @@ func ByAllowMessagesDispatch(opts ...sql.OrderTermOption) OrderOption {
 	return sql.OrderByField(FieldAllowMessagesDispatch, opts...).ToFunc()
 }
 
+// ByRequireOauthOnly orders the results by the require_oauth_only field.
+func ByRequireOauthOnly(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldRequireOauthOnly, opts...).ToFunc()
+}
+
+// ByRequirePrivacySet orders the results by the require_privacy_set field.
+func ByRequirePrivacySet(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldRequirePrivacySet, opts...).ToFunc()
+}
+
 // ByDefaultMappedModel orders the results by the default_mapped_model field.
 func ByDefaultMappedModel(opts ...sql.OrderTermOption) OrderOption {
 	return sql.OrderByField(FieldDefaultMappedModel, opts...).ToFunc()