v2.0.3 - JDownloader auto-reconnect, config UI, English logs

Features:
- Auto-reconnect JDownloader on TOKEN_INVALID errors
- Library rescan endpoints + periodic automatic rescans
- JDownloader monitor scan endpoint + periodic auto-scan
- Scanner button in UI for manual download monitoring
- Config page reorganized: 2-column layout, proper sections

Fixes:
- Fix series size check using wrong URL with /link/infos
- Fix missing sonarr_get replaced with direct API call
- Fix status indicator not updating in UI
- Simplify entrypoint (monitor now handled by FastAPI)

i18n:
- All backend log messages translated to English
- Config page fully i18n'd with data-i18n attributes