4199cee4e5
Replace HttpURLConnection-based networking with OkHttp and add proxy username/password support. Introduces buildOkHttpClient, updated getUrlContent/getUrlContentWithUserAgent signatures, and downloadToFile; callers in AngConfigManager, SpeedtestManager, UpdateCheckerManager, PerAppProxyActivity, UserAssetActivity and UserAssetViewModel now pass SOCKS proxy credentials. Removes createProxyConnection and related URL-resolve logic, clears HTTP inbound auth/udp in V2rayConfigManager, and simplifies SettingsManager port generation. These changes enable authenticated proxy requests, improved redirect handling and more robust file downloads.