✨ 添加开发文档和 API 文档的初始结构；更新 .gitignore 以排除生成的文档目录

docs/en/dev/api/util_hunyuan.md

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+---
+title: util_hunyuan
+---
+# **Module** `nonebot_plugin_marshoai.util_hunyuan`
+
+---
+### ***func*** `generate_image(prompt: str)`
+
+
+<details>
+<summary> <b>Source code</b> or <a href='https://github.com/LiteyukiStudio/nonebot-plugin-marshoai/tree/main/nonebot_plugin_marshoai/util_hunyuan.py#L16' target='_blank'>View on GitHub</a></summary>
+
+```python
+def generate_image(prompt: str):
+    cred = credential.Credential(config.marshoai_tencent_secretid, config.marshoai_tencent_secretkey)
+    httpProfile = HttpProfile()
+    httpProfile.endpoint = 'hunyuan.tencentcloudapi.com'
+    clientProfile = ClientProfile()
+    clientProfile.httpProfile = httpProfile
+    client = hunyuan_client.HunyuanClient(cred, 'ap-guangzhou', clientProfile)
+    req = models.TextToImageLiteRequest()
+    params = {'Prompt': prompt, 'RspImgType': 'url', 'Resolution': '1080:1920'}
+    req.from_json_string(json.dumps(params))
+    resp = client.TextToImageLite(req)
+    return resp.to_json_string()
+```
+</details>
+