feat: Refactor uTLS & Multiplex Support, Node Status Push Optimization

- Server/ServerSave/Server.php: Unified utls and multiplex schema, validation, and defaults for vmess/vless/trojan/mieru protocols, enabling more flexible protocol configuration.
- Protocols (SingBox/ClashMeta/Shadowrocket/Stash/General): All protocol generators now support utls (client-fingerprint/fp) and multiplex options. Removed getRandFingerprint, replaced with getTlsFingerprint supporting random/custom fingerprints.
- Helper.php: Refactored TLS fingerprint utility to support object/string/random input.
- ServerService: Abstracted updateMetrics method to unify HTTP/WS node status caching logic.
- NodeWebSocketServer: Improved node connection, status push, and full sync logic; adjusted log levels; clarified push logic.
- ServerController: Reused ServerService for node metrics handling, reducing code duplication.
- Docs: Improved aapanel installation docs, added fix for empty admin dashboard.

app/Utils/Helper.php

@@ -188,8 +188,20 @@ class Helper
     public static function getIpByDomainName($domain) {
         return gethostbynamel($domain) ?: [];
     }
+    
+    public static function getTlsFingerprint($utls = null)
+    {
+
+        if (is_array($utls) || is_object($utls)) {
+            if (!data_get($utls, 'enabled')) {
+                return null;
+            }
+            $fingerprint = data_get($utls, 'fingerprint', 'chrome');
+            if ($fingerprint !== 'random') {
+                return $fingerprint;
+            }
+        }
 
-    public static function getRandFingerprint() {
         $fingerprints = ['chrome', 'firefox', 'safari', 'ios', 'edge', 'qq'];
         return Arr::random($fingerprints);
     }