feat(usage): 使用记录增加计费模式字段 — 记录/展示/筛选 token/按次/图片

- DB: usage_logs 表新增 billing_mode VARCHAR(20) 列
- 后端: RecordUsage 写入时根据 image_count 判定计费模式
- 前端: 使用记录表格新增计费模式 badge 列 + 筛选下拉

backend/ent/usagelog/usagelog.go

@@ -28,6 +28,14 @@ const (
 	FieldRequestedModel = "requested_model"
 	// FieldUpstreamModel holds the string denoting the upstream_model field in the database.
 	FieldUpstreamModel = "upstream_model"
+	// FieldChannelID holds the string denoting the channel_id field in the database.
+	FieldChannelID = "channel_id"
+	// FieldModelMappingChain holds the string denoting the model_mapping_chain field in the database.
+	FieldModelMappingChain = "model_mapping_chain"
+	// FieldBillingTier holds the string denoting the billing_tier field in the database.
+	FieldBillingTier = "billing_tier"
+	// FieldBillingMode holds the string denoting the billing_mode field in the database.
+	FieldBillingMode = "billing_mode"
 	// FieldGroupID holds the string denoting the group_id field in the database.
 	FieldGroupID = "group_id"
 	// FieldSubscriptionID holds the string denoting the subscription_id field in the database.
@@ -141,6 +149,10 @@ var Columns = []string{
 	FieldModel,
 	FieldRequestedModel,
 	FieldUpstreamModel,
+	FieldChannelID,
+	FieldModelMappingChain,
+	FieldBillingTier,
+	FieldBillingMode,
 	FieldGroupID,
 	FieldSubscriptionID,
 	FieldInputTokens,
@@ -189,6 +201,12 @@ var (
 	RequestedModelValidator func(string) error
 	// UpstreamModelValidator is a validator for the "upstream_model" field. It is called by the builders before save.
 	UpstreamModelValidator func(string) error
+	// ModelMappingChainValidator is a validator for the "model_mapping_chain" field. It is called by the builders before save.
+	ModelMappingChainValidator func(string) error
+	// BillingTierValidator is a validator for the "billing_tier" field. It is called by the builders before save.
+	BillingTierValidator func(string) error
+	// BillingModeValidator is a validator for the "billing_mode" field. It is called by the builders before save.
+	BillingModeValidator func(string) error
 	// DefaultInputTokens holds the default value on creation for the "input_tokens" field.
 	DefaultInputTokens int
 	// DefaultOutputTokens holds the default value on creation for the "output_tokens" field.
@@ -278,6 +296,26 @@ func ByUpstreamModel(opts ...sql.OrderTermOption) OrderOption {
 	return sql.OrderByField(FieldUpstreamModel, opts...).ToFunc()
 }
 
+// ByChannelID orders the results by the channel_id field.
+func ByChannelID(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldChannelID, opts...).ToFunc()
+}
+
+// ByModelMappingChain orders the results by the model_mapping_chain field.
+func ByModelMappingChain(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldModelMappingChain, opts...).ToFunc()
+}
+
+// ByBillingTier orders the results by the billing_tier field.
+func ByBillingTier(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldBillingTier, opts...).ToFunc()
+}
+
+// ByBillingMode orders the results by the billing_mode field.
+func ByBillingMode(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldBillingMode, opts...).ToFunc()
+}
+
 // ByGroupID orders the results by the group_id field.
 func ByGroupID(opts ...sql.OrderTermOption) OrderOption {
 	return sql.OrderByField(FieldGroupID, opts...).ToFunc()