use libfuse(maybe other alteratives) to mount the DCIM and run operations on mounted files directly

Currently, iPurity CLI scans the entire DCIM folder of an external device (e.g., iPhone) by default. Introducing support for mounting the DCIM directory using libfuse (or alternative libraries) would allow for direct file system operations, making it easier to select specific folders or even individual files for scanning. A Terminal User Interface (TUI) can be utilized to display and select mounted folders or specific files, significantly improving usability and precision.

Proposed CLI Commands and Functionality:
```bash
ipurity external mount # New: Mounts DCIM using libfuse or alternatives, enabling selective operations via TUI.
```

Use Cases:
Directly scan specific folders or individual files within the mounted directory.
Quickly verify single images or videos without scanning entire directories.
Improve management and deletion of identified NSFW files due to direct access and visibility of original filenames.