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_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)
+	}
+}