Add proxy configuration support for video wallpapers

[Copilot]

Video wallpapers from geo-restricted websites fail to load without proxy support, resulting in black screens. This adds configurable proxy settings (HTTP/HTTPS/SOCKS5) with optional authentication.

Implementation

Core Settings (Sucrose.Memory, Sucrose.Manager)

• Added 6 proxy constants: ProxyEnabled, ProxyType, ProxyServer, ProxyPort, ProxyUsername, ProxyPassword
• Created ProxyType enum: None, HTTP, HTTPS, SOCKS5
• Added validated getters to Engine manager

Engine Integration

• MPV Player: Injects http-proxy=scheme://[user:pass@]host:port into mpv.conf on startup
• CefSharp: Adds --proxy-server=scheme://host:port to CefSettings command-line args
• WebView2: Adds --proxy-server="scheme://host:port" to AdditionalBrowserArguments

UI (Sucrose.Portal)

• Added Network section to Other Settings with expandable proxy configuration card
• Fields: enable toggle, type dropdown, server/port inputs, optional username/password
• All changes persist to Engine settings JSON

Localization

• Added English strings for Network area, proxy settings, and ProxyType enum values

Example

// MPV Player generates config on startup
if (SMME.ProxyEnabled && !string.IsNullOrEmpty(SMME.ProxyServer) && SMME.ProxyPort > 0)
{
    string protocol = SMME.ProxyType switch {
        SSDEPT.SOCKS5 => "socks5",
        SSDEPT.HTTPS => "https",
        _ => "http"
    };
    Content += $"http-proxy={protocol}://{auth}{SMME.ProxyServer}:{SMME.ProxyPort}";
}

Notes

• Proxy authentication in CefSharp/WebView2 requires IRequestHandler implementation for full support (username/password fields prepared for future enhancement)
• Local media engines (Nebula, Xavier, Vexana, Aurora) unaffected - no network access needed
• Settings require wallpaper restart to take effect

Files changed: 10 files, 375 additions, 1 deletion

Original prompt

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This section details on the original issue you should resolve

<issue_title>Could you add a proxy usage function in the settings options?</issue_title>
<issue_description>Is your feature request related to a problem? Please describe.
Hello, could you please add an option to use proxy functions (such as SOCKS5) in the software's settings? When using video links from certain websites, a proxy setup is required; otherwise, the video fails to load and the wallpaper remains completely black.
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Could you add a proxy usage function in the settings options? #157

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