feat(sub): add Happ client integration, routing presets, and app management (#6434)

* feat(sub): add Happ client integration, routing presets, and app management

Implement comprehensive Happ proxy client integration according to official developer specifications.

- Fix header emission on disabled routing and hidden settings to send explicit '0' headers rather than omitting, allowing Happ clients to reset cached settings.
- Add support for 'happ://routing/off' deeplink in routing validation.
- Preserve '?serverDescription=' query parameters in link fragments without escaping to support Happ server subtitles across VMess, VLESS, Trojan and SS.
- Add Happ application management headers: ProviderID, New-Url, Fallback-Url, Sub-Info banners, Sub-Expire notifications, No-Limit mode, hardware ID enforcement, TUN modes/types, route exclusions, APNS exclusions, and per-app proxy settings.
- Add curated routing presets (Iran Bypass, China Direct, AdBlock, Global) and interactive visual rule generator in frontend settings.
- Synchronize all 13 translation locales with native Persian, Russian, and Chinese translations.

* fix(sub): keep Happ header overrides behind the auto-detect opt-in

The Routing-Enable/Hide-Settings off values were emitted on the
User-Agent alone, so every panel that upgraded would push
"Routing-Enable: 0" — documented by happ.su as disabling routing
globally — to every Happ client without the operator enabling anything.
They now ride subHappAutoDetect like every other Happ header.

Two further mismatches against the vendor spec:

- serverDescription was written as a key of the VMess base64 JSON
  object. happ.su documents it as a "#Title?serverDescription=<base64>"
  link parameter or a JSON "meta" entry, so the caption never reached
  Happ while every other VMess consumer received an unknown key.
  Dropped rather than moved: emitting the documented form is unsafe
  here because our own parser base64-decodes the whole VMess body
  (internal/util/link/outbound.go).

- The TUN Mode dropdown stored the literal "default", forwarded as
  "Tun-Mode: default", where happ.su documents system|gvisor only. It
  now stores the unset value so no header is sent. TUN Type "default"
  is a documented value and is unchanged.

Each fix carries a test that fails without it.

internal/sub/sub.go

@@ -215,6 +215,31 @@ func (s *Server) initRouter() (*gin.Engine, error) {
 		SubIncyRoutingRules = ""
 	}
 
+	happCfg := HappConfig{}
+	happCfg.AutoDetect, _ = s.settingService.GetSubHappAutoDetect()
+	happCfg.ProviderId, _ = s.settingService.GetSubHappProviderId()
+	happCfg.NewUrl, _ = s.settingService.GetSubHappNewUrl()
+	happCfg.FallbackUrl, _ = s.settingService.GetSubHappFallbackUrl()
+	happCfg.SubInfoColor, _ = s.settingService.GetSubHappSubInfoColor()
+	happCfg.SubInfoText, _ = s.settingService.GetSubHappSubInfoText()
+	happCfg.SubInfoButtonText, _ = s.settingService.GetSubHappSubInfoButtonText()
+	happCfg.SubInfoButtonLink, _ = s.settingService.GetSubHappSubInfoButtonLink()
+	happCfg.SubExpire, _ = s.settingService.GetSubHappSubExpire()
+	happCfg.SubExpireButtonLink, _ = s.settingService.GetSubHappSubExpireButtonLink()
+	happCfg.NotificationExpire, _ = s.settingService.GetSubHappNotificationExpire()
+	happCfg.NoLimit, _ = s.settingService.GetSubHappNoLimit()
+	happCfg.AlwaysHwid, _ = s.settingService.GetSubHappAlwaysHwid()
+	happCfg.TunMode, _ = s.settingService.GetSubHappTunMode()
+	happCfg.TunType, _ = s.settingService.GetSubHappTunType()
+	happCfg.ExcludeRoutes, _ = s.settingService.GetSubHappExcludeRoutes()
+	happCfg.ExcludeApns, _ = s.settingService.GetSubHappExcludeApns()
+	happCfg.ColorProfile, _ = s.settingService.GetSubHappColorProfile()
+	happCfg.PingType, _ = s.settingService.GetSubHappPingType()
+	happCfg.AutoConnect, _ = s.settingService.GetSubHappAutoConnect()
+	happCfg.AutoConnectType, _ = s.settingService.GetSubHappAutoConnectType()
+	happCfg.PerAppMode, _ = s.settingService.GetSubHappPerAppMode()
+	happCfg.PerAppList, _ = s.settingService.GetSubHappPerAppList()
+
 	// set per-request localizer from headers/cookies
 	engine.Use(locale.LocalizerMiddleware())
 
@@ -296,6 +321,7 @@ func (s *Server) initRouter() (*gin.Engine, error) {
 		WithSUBEnableRouting(SubEnableRouting),
 		WithSUBRoutingRules(SubRoutingRules),
 		WithSUBHideSettings(SubHideSettings),
+		WithSUBHappConfig(happCfg),
 		WithSUBIncyEnableRouting(SubIncyEnableRouting),
 		WithSUBIncyRoutingRules(SubIncyRoutingRules),
 	)