Remove streamSettings for protocols that don't support it

- Frontend: Only include streamSettings in toJson() for vmess, vless, trojan, shadowsocks, and hysteria protocols
- Frontend: Hide Stream tab in Advanced section for unsupported protocols
- Frontend: Clear streamSettings in Advanced tab when switching to unsupported protocols
- Frontend: Add CodeMirror JSON editor to config view in index page with mobile responsive design
- Backend: Add normalizeStreamSettings() to clear streamSettings for tunnel, mixed, http, tun, and wireguard protocols
- Backend: Apply normalization in AddInbound() and UpdateInbound()
- Backend: Add omitempty JSON tag to StreamSettings field to exclude null values from Xray config

frontend/src/models/inbound.js

@@ -2412,20 +2412,25 @@ export class Inbound extends XrayCommonClass {
     }
 
     toJson() {
-        let streamSettings;
-        if (this.canEnableStream() || this.stream?.sockopt) {
-            streamSettings = this.stream.toJson();
-        }
-        return {
+        // Only these protocols use streamSettings
+        const streamProtocols = [Protocols.VLESS, Protocols.VMESS, Protocols.TROJAN, Protocols.SHADOWSOCKS, Protocols.HYSTERIA];
+
+        const result = {
             port: this.port,
             listen: this.listen,
             protocol: this.protocol,
             settings: this.settings instanceof XrayCommonClass ? this.settings.toJson() : this.settings,
-            streamSettings: streamSettings,
             tag: this.tag,
             sniffing: this.sniffing.toJson(),
             clientStats: this.clientStats
         };
+
+        // Only add streamSettings if protocol supports it
+        if (streamProtocols.includes(this.protocol)) {
+            result.streamSettings = this.stream.toJson();
+        }
+
+        return result;
     }
 }