feat(sub): add dummy info node and status configs for subscriptions (#6412)

* feat(settings): add subInfoNodeEnable and status template settings

* feat(sub): add dummy info node and status configs for raw links

* feat(sub): support dummy info node in clash and json subscriptions

* feat(ui): add subscription info node switch and status templates to settings

* style: apply gofumpt formatting

* fix(sub): address review feedback on subscription info node

- Restore GetSubs contract to avoid unintended remark expansions on non-subscription-body calls.
- Exclude dummy info node from Clash PROXY select group when active server nodes exist.
- Track hasEnabledClient and set traffic.Enable in JSON and Clash paths so status tokens evaluate correctly.
- Deterministically sort client emails across subscriptions before selecting primaryEmail.
- Consolidate duplicated info-node evaluation logic into resolveInfoNodeRemark helper.
- Remove redundant pure-getter test from setting_sub_info_node_test.go.

Co-Authored-By: Claude Code <noreply@anthropic.com>

---------

Co-authored-by: Claude Code <noreply@anthropic.com>

internal/web/service/setting.go

@@ -34,11 +34,13 @@ import (
 var xrayTemplateConfig string
 
 const (
-	DefaultSubClashUserAgentRegex = `(?i)(clash|mihomo)`
-	DefaultSubJsonUserAgentRegex  = ``
-	DefaultRemarkTemplate         = "{{INBOUND}}-{{EMAIL}}|📊{{TRAFFIC_LEFT}}|⏳{{DAYS_LEFT}}D"
-	DefaultTrustedProxyCIDRs      = "127.0.0.1/32,::1/128"
-	maxRegexLength                = 2048
+	DefaultSubClashUserAgentRegex     = `(?i)(clash|mihomo)`
+	DefaultSubJsonUserAgentRegex      = ``
+	DefaultRemarkTemplate             = "{{INBOUND}}-{{EMAIL}}|📊{{TRAFFIC_LEFT}}|⏳{{DAYS_LEFT}}D"
+	DefaultSubExpiredTemplate         = "⛔ {{EMAIL}} | Expired: {{EXPIRE_DATE}}"
+	DefaultSubTrafficDepletedTemplate = "🚫 {{EMAIL}} | Traffic Depleted | {{TRAFFIC_USED}}/{{TRAFFIC_TOTAL}}"
+	DefaultTrustedProxyCIDRs          = "127.0.0.1/32,::1/128"
+	maxRegexLength                    = 2048
 )
 
 var defaultValueMap = map[string]string{
@@ -70,6 +72,9 @@ var defaultValueMap = map[string]string{
 	"trafficDiff":                 "0",
 	"remarkTemplate":              DefaultRemarkTemplate,
 	"subShowIdentityOnAllLinks":   "false",
+	"subInfoNodeEnable":           "false",
+	"subExpiredTemplate":          DefaultSubExpiredTemplate,
+	"subTrafficDepletedTemplate":  DefaultSubTrafficDepletedTemplate,
 	"timeLocation":                "Local",
 	"tgBotEnable":                 "false",
 	"tgBotToken":                  "",
@@ -676,6 +681,18 @@ func (s *SettingService) GetSubShowIdentityOnAllLinks() (bool, error) {
 	return s.getBool("subShowIdentityOnAllLinks")
 }
 
+func (s *SettingService) GetSubInfoNodeEnable() (bool, error) {
+	return s.getBool("subInfoNodeEnable")
+}
+
+func (s *SettingService) GetSubExpiredTemplate() (string, error) {
+	return s.getString("subExpiredTemplate")
+}
+
+func (s *SettingService) GetSubTrafficDepletedTemplate() (string, error) {
+	return s.getString("subTrafficDepletedTemplate")
+}
+
 func (s *SettingService) GetSecret() ([]byte, error) {
 	secret, err := s.getString("secret")
 	if secret == "" || secret == defaultValueMap["secret"] {

internal/web/service/setting_sub_info_node_test.go

@@ -0,0 +1,44 @@
+package service
+
+import (
+	"testing"
+)
+
+func TestSubInfoNodeSettingsDefaultsAndPersists(t *testing.T) {
+	setupSettingTestDB(t)
+	s := &SettingService{}
+
+	settings, err := s.GetAllSetting()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if settings.SubInfoNodeEnable {
+		t.Fatal("expected default SubInfoNodeEnable false")
+	}
+	if settings.SubExpiredTemplate != DefaultSubExpiredTemplate {
+		t.Fatalf("expected default SubExpiredTemplate %q, got %q", DefaultSubExpiredTemplate, settings.SubExpiredTemplate)
+	}
+	if settings.SubTrafficDepletedTemplate != DefaultSubTrafficDepletedTemplate {
+		t.Fatalf("expected default SubTrafficDepletedTemplate %q, got %q", DefaultSubTrafficDepletedTemplate, settings.SubTrafficDepletedTemplate)
+	}
+
+	settings.SubInfoNodeEnable = true
+	settings.SubExpiredTemplate = "custom expired"
+	settings.SubTrafficDepletedTemplate = "custom depleted"
+	if err := s.UpdateAllSetting(settings, SecretClears{}); err != nil {
+		t.Fatal(err)
+	}
+
+	gotEnabled, err := s.GetSubInfoNodeEnable()
+	if err != nil || !gotEnabled {
+		t.Fatalf("expected true, got %v, err %v", gotEnabled, err)
+	}
+	gotExp, err := s.GetSubExpiredTemplate()
+	if err != nil || gotExp != "custom expired" {
+		t.Fatalf("expected 'custom expired', got %q, err %v", gotExp, err)
+	}
+	gotDep, err := s.GetSubTrafficDepletedTemplate()
+	if err != nil || gotDep != "custom depleted" {
+		t.Fatalf("expected 'custom depleted', got %q, err %v", gotDep, err)
+	}
+}