feat: apply proxy settings to Electron, Python, and child processes

[snomiao]

Summary

• Read Comfy.Network.Proxy.* settings from comfy.settings.json on app startup
• Configure Chromium via session.defaultSession.setProxy() for Electron's own network
• Set process.env HTTP_PROXY/HTTPS_PROXY/NO_PROXY for all child processes
• Inject --http-proxy/--https-proxy/--no-proxy into Python server launch args
• Forward proxy env vars to uv PTY sessions for pip/package installs

Part of a cross-repo feature. Related PRs:

• Comfy-Org/ComfyUI — backend CLI args + env var setup
• Comfy-Org/ComfyUI_frontend — proxy settings UI

Ref: #1105

Test plan

• Set proxy URL in Settings > Comfy > Network, restart app
• Verify Python server receives --http-proxy arg
• Verify Electron BrowserWindow routes through proxy
• Verify uv/pip operations use proxy during package installs
• No proxy configured = no behavior change

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