docs(strm): add save local mode

pages/guide/advanced/strm.md

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-<!--@include: ../drivers/strm_text.md-->
+::: en
+**Strm** is a driver that allows you to convert supported files from multiple cloud drives into .strm files.
+
+::: warning Important Notes
+Please understand the function of strm files before use
+
+Only the **`Download Preview (Read-Only)`** operation is supported. Other operations such as **Copy, Delete, Rename,
+Offline Download, Upload** are **not supported**.
+
+Strm uses a local proxy method, and during the **`Download Preview (Read-Only)`** operation, it will consume bandwidth
+from the deployed machine (depending on the number of files; individual files typically consume less than 100KB).
+:::
+
+### Parameter Descriptions { lang="en" }
+
+::: en
+
+- **Path:** The full path in OpenList where .strm files should be generated.
+  Examples:
+  ```
+  /115_open/Video
+  /kuake_open/Video
+  ```
+- **Site URL:** The URL prefix for the generated .strm files.
+
+  For example, if the directory /115_open/Video contains the file:`/电影/再见，李可乐 (2023)/再见，李可乐 (2023) - 2160p.mkv`
+
+  And you enter http://localhost:5244 as the Site URL, the generated .strm file will point to:
+  `http://localhost:5244/d/115_open/Video/电影/再见，李可乐 (2023)/再见，李可乐 (2023) - 2160p.strm`
+
+  This field is optional. If left blank, the current access URL will be used as the default prefix.
+
+- **File Type Filter:** Specify which file types should be included for .strm generation.
+
+  The following types are built-in:
+
+  ```
+  Video Type
+  mp4,mkv,flv,avi,wmv,ts,rmv,web
+
+  Audio Type
+  mp3,flac,aac,wav,ogg,m4a,wma,alac
+  ```
+
+  You can add more types as needed. Use **commas (,)** to separate multiple file types.
+
+- **Encode Path:** Whether to enable URL path encoding.
+
+  If disabled, the .strm URL will be:
+  `http://localhost:5244/d/Video/电影/再见，李可乐 (2023)/再见，李可乐 (2023) - 2160p.stm`
+
+  If enabled, it will be:
+  `http://localhost:5244/d/Video/%E7%94%B5%E5%BD%B1/%E5%86%8D%E8%A7%81%EF%BC%8C%E6%9D%8E%E5%8F%AF%E4%B9%90%20(2023)/%E5%86%8D%E8%A7%81%EF%BC%8C%E6%9D%8E%E5%8F%AF%E4%B9%90%20(2023)%20-%202160p.mkv`
+
+- **Without Url:** The generated strm file after opening will not contain URL prefixes
+
+- **SaveStrmToLocal:** When enabled, accessing a directory within or mounted by the Strm driver will save the Strm files locally
+
+- **SaveStrmLocalPath:** The local directory path where Strm files are stored.
+
+- **Local Save Mode:**
+
+  `Insert Mode`: Only generate files that do not exist locally; existing local files will not be modified.
+
+  `Update Mode`: Generate files that do not exist locally and update the content of existing local files to the latest
+  version.
+
+  `Sync Mode`: Based on Update Mode, additionally delete local files that no longer exist on the cloud drive.
+
+:::
+
+::: zh-CN
+**Strm** 是一种可以将多个不同云盘中的支持的文件转换为strm文件的驱动。
+
+::: warning 注意事项
+使用前请先了解strm文件作用
+
+除了 **`下载预览（只读）`** 操作外，其他操作如 **复制、删除、重命名、离线下载、上传** 均不支持。
+
+Strm采用本地代理方式，在 **`下载预览（只读）`** 操作时会消耗一定部署机器的流量（取决于文件数量、单个文件一般不超过100KB）
+:::
+
+### 参数介绍 { lang="zh-CN" }
+
+::: zh-CN
+
+- **路径**：需要生成strm文件的`OpenList上的完整路径`。
+
+  例如
+
+  ```
+  /115_open/Video
+  /kuake_open/Video
+  ```
+
+- **站点URL**：Strm文件的URL前缀。
+
+  如在`/115_open/Video`目录下有`/电影/再见，李可乐 (2023)/再见，李可乐 (2023) - 2160p.mkv`
+
+  填写`http://localhost:5244` 则生成的Strm文件为
+  `http://localhost:5244/d/115_open/Video/电影/再见，李可乐 (2023)/再见，李可乐 (2023) - 2160p.strm`
+
+  此项可默认不填、不填时URL前缀会采用你当前访问的地址作为URL前缀
+
+- **过滤文件类型**：过滤需要生成的strm的文件类型
+
+  目前内置了如下文件类型
+
+  ```
+  视频类型
+  mp4,mkv,flv,avi,wmv,ts,rmv,web
+
+  音频类型
+  mp3,flac,aac,wav,ogg,m4a,wma,alac
+  ```
+
+  可以自行补充，多文件类型间采用 **,** 分割
+
+- **编码路径**：是否启用路径编码
+
+  不启用时生成的strm文件为 `http://localhost:5244/d/Video/电影/再见，李可乐 (2023)/再见，李可乐 (2023) - 2160p.stm`
+
+  启用时
+  `http://localhost:5244/d/Video/%E7%94%B5%E5%BD%B1/%E5%86%8D%E8%A7%81%EF%BC%8C%E6%9D%8E%E5%8F%AF%E4%B9%90%20(2023)/%E5%86%8D%E8%A7%81%EF%BC%8C%E6%9D%8E%E5%8F%AF%E4%B9%90%20(2023)%20-%202160p.mkv`
+
+- **不包含URL前缀**：开启后生成的strm文件将不包含URL前缀
+
+- **保存Strm文件至本地**: 开启后访问 strm 驱动中目录或被 strm 驱动挂载的目录时会将 strm 文件保存至本地
+
+- **保存Strm文件本地路径**: strm文件保存的本地路径
+
+- **保存本地模式**：
+
+  `新增模式`: 仅对本地没有的文件进行生成，对本地文件不进行任何操作
+
+  `更新模式`: 对本地没有的文件进行生成同时更新本地文件内容至最新
+
+  `同步模式`: 在更新模式的基础上删除本地中网盘没有的文件
+
+:::