docs: refactor README by moving sections to docs/ folder

Move 11 documentation sections to separate markdown files in docs/:
- models.md, load-balancing.md, web-console.md, configuration.md
- menubar-app.md, api-endpoints.md, testing.md, troubleshooting.md
- safety-notices.md, legal.md, development.md

README now contains a Documentation section with links to each doc.
Also moved donation link to above Star History section.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docs/web-console.md

@@ -0,0 +1,20 @@
+# Web Management Console
+
+The proxy includes a built-in, modern web interface for real-time monitoring and configuration. Access the console at: `http://localhost:8080` (default port).
+
+![Antigravity Console](../images/webui-dashboard.png)
+
+## Key Features
+
+- **Real-time Dashboard**: Monitor request volume, active accounts, model health, and subscription tier distribution.
+- **Visual Model Quota**: Track per-model usage and next reset times with color-coded progress indicators and draggable per-account threshold markers.
+- **Account Management**: Add/remove Google accounts via OAuth, view subscription tiers (Free/Pro/Ultra), quota status, and per-account threshold settings.
+- **Manual OAuth Mode**: Add accounts on headless servers by copying the OAuth URL and pasting the authorization code.
+- **Claude CLI Configuration**: Edit your `~/.claude/settings.json` directly from the browser.
+- **Persistent History**: Tracks request volume by model family for 30 days, persisting across server restarts.
+- **Time Range Filtering**: Analyze usage trends over 1H, 6H, 24H, 7D, or All Time periods.
+- **Smart Analysis**: Auto-select top 5 most used models or toggle between Family/Model views.
+- **Live Logs**: Stream server logs with level-based filtering and search.
+- **Quota Protection**: Set global or per-account minimum quota thresholds to proactively switch accounts before quota runs out.
+- **Advanced Tuning**: Configure retries, timeouts, and debug mode on the fly.
+- **Multi-language Interface**: Full support for English, Chinese (中文), Indonesian (Bahasa), Portuguese (PT-BR), and Turkish (Türkçe).