feat: add app GPT4Free

apps/gpt4free/README_en.md

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+# GPT4Free
+
+GPT4Free is an open-source project that provides free access to GPT-4 and other large language models. It supports various models such as GPT-4, Claude, Gemini, and more, allowing users to access these powerful AI models for free.
+
+![](https://cdn.jsdelivr.net/gh/xiaoY233/PicList@main/public/assets/gpt4free.png)
+
+![](https://cdn.jsdelivr.net/gh/xiaoY233/PicList@main/public/assets/GPT4Free-Model.png)
+
+![](https://img.shields.io/badge/Copyright-arch3rPro-ff9800?style=flat&logo=github&logoColor=white)
+
+
+## Features
+
+- Support for multiple large language models including GPT-4, Claude, Gemini, and more
+- OpenAI-compatible API interface
+- Text and image generation capabilities
+- Built-in web interface for easy use
+- Support for both local inference and remote API calls
+
+## Usage
+
+After installation, you can access GPT4Free through:
+
+1. Web Interface: Visit `http://your-ip:8080/chat/` to use the built-in chat interface
+2. API Interface: Use `http://your-ip:1337/v1` as your API base URL
+
+## Environment Variables
+
+- `OLLAMA_HOST`: Ollama server address, defaults to host.docker.internal
+
+## Port Information
+
+- 8080: Web interface and API
+- 1337: Alternative API port
+- 7900: Remote desktop (for provider login)
+
+## More Information
+
+- Official Website: [g4f.dev](https://g4f.dev/)
+- GitHub Repository: [github.com/xtekky/gpt4free](https://github.com/xtekky/gpt4free)
+- Documentation: [g4f.dev/docs](https://github.com/gpt4free/g4f.dev/blob/main/docs)