Fix Windows tray auto reconnect by passing config to oneshot

[8rief]

Summary

This fixes Windows tray/server auto reconnect after offline detection.

The Windows server entrypoint was calling oneshot() without a config object. This stayed hidden while the network was already online because oneshot() returned before reaching login(config). Once offline, the reconnect loop called login(config), which accessed config.url and failed because config was undefined.

The patch loads config once in src/windows/main.ts and passes it to both the scheduled routine and the manual /login route.

It also redacts the password from trace logging in src/lib/login.ts.

Verification

• bunx tsc --noEmit
• bun run -F xdwlan-login build:windows
• cargo build --release
• Windows server smoke test: /health returns ok, /quit returns ok

Fixes #22.

[silverling]

Thanks for your contribution! Sorry for my lateness. LGTM.