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feat: Warm Industrial UI redesign + social footer + code deduplication

Design System (Phase A):
- New palette: warm charcoal #111110 / amber gold #c9954a / sage green #7a9a8a
- Fonts: Cabinet Grotesk (heading) + Geist (body) + JetBrains Mono (data)
- SVG grain texture overlay, collapsed sidebar with hover expand
- Bento grid dashboard with WideContinueCard + PosterCard + QuickLink
- Backward-compatible CSS aliases for glass-panel/neon-button/input-base

Social Footer (Phase B):
- AppFooter component with GitHub repo / author homepage / TG group links
- Embedded in LoginPage, Layout (global), and SettingsPage
- TG group badge added to README.md

Code Cleanup:
- Removed deprecated DownloadClientCard / NotifyChannelCard components
- Merged downloadClient/notify API clients into unified modules
- Route deduplication: removed authed-group duplicates for admin endpoints
- Removed redundant AdminPage tabs (sites/downloads/notify/scheduler)
- UI fixes: blank pages (discover/download-clients/notify-channels) nil slice defense
- Email channel support in NotifyChannelsPage
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README.md

@@ -10,6 +10,7 @@
 
 <p align="center">
   <a href="README_EN.md"><img src="https://img.shields.io/badge/English-README-blue?style=flat-square" alt="English"></a>
+  <a href="https://t.me/MediaStationGo"><img src="https://img.shields.io/badge/Telegram-群组-26A5E4?style=flat-square&logo=telegram&logoColor=white" alt="Telegram 群组"></a>
 </p>
 
 <p align="center">