feat: create app PortNote

apps/portnote/README_en.md

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+<div align="center">
+    <h1><b>PortNote</b></h1>
+    <p>
+        Lightweight server port management and visualization tool
+        <br />
+        <a href="https://github.com/crocofied/PortNote"><strong>GitHub</strong></a>
+    </p>
+</div>
+<br />
+
+> [!NOTE]
+> PortNote is a lightweight server port management and visualization tool, suitable for asset and port information management, supporting cross-platform deployment.
+
+## Features
+- Visual management of port information
+- Batch management for multiple servers and ports
+- Record port usage, owner, remarks, etc.
+- Mark port status (used, idle, reserved, etc.)
+- Import/export (JSON, Excel)
+- One-click Docker deployment
+- Custom fields supported
+- Multi-user collaboration
+
+## Getting Started
+### Docker Deployment
+```bash
+docker run -d \
+  -p 8080:8080 \
+  -v $PWD/data:/app/data \
+  --name portnote \
+  crocofied/portnote:latest
+```
+- Default access: http://localhost:8080
+- Data will be persisted in the mounted `data` directory
+
+### Other Deployment Methods
+See the [official documentation](https://github.com/crocofied/PortNote/blob/main/README.md) for details.
+
+## Screenshot
+<p align="center">
+<img alt="screenshot" src="https://raw.githubusercontent.com/crocofied/PortNote/main/docs/images/portnote-main.png" width="80%">
+</p>
+
+## FAQ
+- **Q: Which platforms are supported?**
+  A: Docker, Linux, Windows, MacOS are supported.
+- **Q: How to backup data?**
+  A: Data is stored in the mounted data directory, just backup this directory.
+- **Q: Does it support multi-user collaboration?**
+  A: Yes, you can assign different permissions to different users.
+- **Q: Can I customize port fields?**
+  A: Yes, you can customize fields in the settings.
+
+## Links
+- GitHub: https://github.com/crocofied/PortNote
+- Documentation: https://github.com/crocofied/PortNote/blob/main/README.md