refactor(auth): replace dashboard sessions with stateless tokens and session control (#6329)

* refactor(auth): replace dashboard sessions with stateless tokens

* feat(auth): harden session issuance and distributed enforcement

* fix(proxy): preserve trusted proxy compatibility defaults

* refactor: address dashboard auth review feedback

* refactor: remove classic frontend and flatten web app

controller/misc.go

@@ -63,7 +63,7 @@ func GetStatus(c *gin.Context) {
 		"linuxdo_minimum_trust_level": common.LinuxDOMinimumTrustLevel,
 		"telegram_oauth":              common.TelegramOAuthEnabled,
 		"telegram_bot_name":           common.TelegramBotName,
-		"theme":                       system_setting.GetThemeSettings().Frontend,
+		"theme":                       "default",
 		"system_name":                 common.SystemName,
 		"logo":                        common.Logo,
 		"footer_html":                 common.Footer,