fix(channel-monitor-v2): 修复 CI gofmt 与 public settings 注入契约

对齐 gofmt，并在 PublicSettingsInjectionPayload 补齐 channel_monitor_mode，
使 SSR 注入字段与 dto.PublicSettings 一致，修复 schema drift 单测失败。

backend/internal/service/channel_monitor_v2_test.go

@@ -10,13 +10,13 @@ import (
 )
 
 type channelMonitorV2RepoStub struct {
-	config  serviceChannelMonitorV2ConfigAlias
-	users   *ChannelMonitorV2List[ChannelMonitorV2UserRow]
-	matrix  *ChannelMonitorV2Matrix
-	errors  *ChannelMonitorV2List[ChannelMonitorV2ErrorRow]
-	snap    *ChannelMonitorV2Snapshot
-	group   ChannelMonitorV2GroupBy
-	admin   bool
+	config serviceChannelMonitorV2ConfigAlias
+	users  *ChannelMonitorV2List[ChannelMonitorV2UserRow]
+	matrix *ChannelMonitorV2Matrix
+	errors *ChannelMonitorV2List[ChannelMonitorV2ErrorRow]
+	snap   *ChannelMonitorV2Snapshot
+	group  ChannelMonitorV2GroupBy
+	admin  bool
 }
 
 // Alias keeps composite literals readable without introducing another package.

backend/internal/service/setting_public.go

@@ -595,17 +595,18 @@ type PublicSettingsInjectionPayload struct {
 	// Feature flags — MUST match the opt-in/opt-out registry in
 	// frontend/src/utils/featureFlags.ts. Missing a field here is the bug
 	// that hid the "可用渠道" menu on page refresh.
-	ChannelMonitorEnabled                bool `json:"channel_monitor_enabled"`
-	ChannelMonitorDefaultIntervalSeconds int  `json:"channel_monitor_default_interval_seconds"`
+	ChannelMonitorEnabled                bool   `json:"channel_monitor_enabled"`
+	ChannelMonitorMode                   string `json:"channel_monitor_mode"`
+	ChannelMonitorDefaultIntervalSeconds int    `json:"channel_monitor_default_interval_seconds"`
 	// ChannelMonitorHideThroughput is public so the user UI can hide RPM/TPM
 	// without waiting for API redaction alone (defense in depth).
 	ChannelMonitorHideThroughput bool `json:"channel_monitor_hide_throughput"`
 	AvailableChannelsEnabled     bool `json:"available_channels_enabled"`
-	ModelPlazaEnabled                    bool `json:"model_plaza_enabled"`
-	ModelPlazaRequireAuth                bool `json:"model_plaza_require_auth"`
-	AffiliateEnabled                     bool `json:"affiliate_enabled"`
-	RiskControlEnabled                   bool `json:"risk_control_enabled"`
-	AllowUserViewErrorRequests           bool `json:"allow_user_view_error_requests"`
+	ModelPlazaEnabled            bool `json:"model_plaza_enabled"`
+	ModelPlazaRequireAuth        bool `json:"model_plaza_require_auth"`
+	AffiliateEnabled             bool `json:"affiliate_enabled"`
+	RiskControlEnabled           bool `json:"risk_control_enabled"`
+	AllowUserViewErrorRequests   bool `json:"allow_user_view_error_requests"`
 }
 
 // GetPublicSettingsForInjection returns public settings in a format suitable for HTML injection.
@@ -675,6 +676,7 @@ func (s *SettingService) GetPublicSettingsForInjection(ctx context.Context) (any
 		BalanceLowNotifyRechargeURL:      settings.BalanceLowNotifyRechargeURL,
 
 		ChannelMonitorEnabled:                settings.ChannelMonitorEnabled,
+		ChannelMonitorMode:                   settings.ChannelMonitorMode,
 		ChannelMonitorDefaultIntervalSeconds: settings.ChannelMonitorDefaultIntervalSeconds,
 		ChannelMonitorHideThroughput:         settings.ChannelMonitorHideThroughput,
 		AvailableChannelsEnabled:             settings.AvailableChannelsEnabled,

backend/internal/service/wire.go

@@ -1,9 +1,9 @@
 package service
 
 import (
-	"os"
 	"context"
 	"database/sql"
+	"os"
 	"time"
 
 	dbent "github.com/Wei-Shaw/sub2api/ent"
@@ -916,7 +916,6 @@ func ProvideChannelMonitorRunner(svc *ChannelMonitorService, settingService *Set
 	return r
 }
 
-
 // ProvideChannelMonitorV2Service wires settings for user-facing privacy flags
 // (e.g. hide RPM/TPM throughput).
 func ProvideChannelMonitorV2Service(repo ChannelMonitorV2Repository, settingService *SettingService) *ChannelMonitorV2Service {