feat(apps): add 9router application package

新增9Router应用，包含多版本部署配置、应用元数据和中英文说明文档，提供AI路由和Token节省功能，支持40+AI提供商与100+模型。

apps/9router/README_en.md

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+# 9Router
+
+FREE AI Router & Token Saver. Connect to 40+ AI providers and 100+ models, works with Claude Code, Cursor, Codex, Copilot, Cline and more AI coding tools.
+
+## Features
+
+- RTK Token Saver - Auto-compress tool outputs, save 20-40% tokens per request
+- Smart 3-Tier Fallback - Auto-route: Subscription → Cheap → Free, zero downtime
+- Real-Time Quota Tracking - Live token count and reset countdown
+- Multi-Account Support - Multiple accounts per provider for load balancing
+- Format Translation - OpenAI ↔ Claude ↔ Gemini format conversion
+- Support 40+ providers and 100+ models
+
+## Usage
+
+### Default Port
+
+- Web UI: 20128
+
+### URLs
+
+- Dashboard: http://localhost:20128/dashboard
+- OpenAI-compatible API: http://localhost:20128/v1
+
+### Data Directory
+
+Application data is stored in the `./data` directory, including SQLite database and automatic backups.
+
+### Environment Variables
+
+- `DATA_DIR` - Data directory path (fixed to /app/data in container)
+- `PORT` - Service port (default 20128)
+- `HOSTNAME` - Listen address (default 0.0.0.0)
+- `DEBUG` - Debug mode (optional, set to true to enable)
+
+## Links
+
+- Website: https://9router.com
+- GitHub: https://github.com/decolua/9router
+- Documentation: https://github.com/decolua/9router/blob/master/README.md