feat: QR code phone pairing for Decky plugin + MangoHud guide revision + SteamOS version fix
- Add plugin_pairings table + migration (0028) for short-lived pairing sessions - Add pairing API: POST /api/plugin/pair/initiate, GET /status/:token, POST /confirm - Add /pair web page: user scans QR on phone, confirms, API key auto-created - Plugin: 'Pair with Phone' button renders QR code (qrcode.react), polls for status, saves API key - Plugin: new initiate_pair + check_pair_status Python RPCs - Revise MangoHud Setup Guide into clean numbered steps - Fix SteamOS version detection: read VERSION_ID + BUILD_ID (was just 'SteamOS')
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