Support in-camera import

[justin13888]

Description

Import photos/videos directly from mirrorless cameras to Capsule app directly. We will support Sony Alpha cameras for now and to each camera.

Use Case

Professional photographers often face a barrier from acquisition to import. The most common solution is taking the SD/CFExpress cards and copying over into a computer. We want importing content directly into Capsule to be efficient and robust.

Proposed Solution (optional)

Most professional cameras support PTP/IP and some extension. Specifically for Sony, it also extends write functionality (e.g. deleting files) via Camera Remote API. They provide a C++ SDK (compileable for only common desktop platforms) and an application: https://pro.sony/en_CA/digital-imaging/camera-remote-toolkit

There are existing libraries that may provide a working PTP/IP implementation (e.g., https://github.com/gphoto/libgphoto2) but it may be best to implement our own portable library in Rust instead.

Technical considerations:

• All transfers should be robust against data-loss. Checksum end-to-end (note PTP/IP does not provide any hashes by itself but TCP's guarantees is "good enough").
• Imports from any device (including from cameras) should be deduplicated on import. This prevents re-imports from including previously imported assets.

[justin13888]

Design is now pre-planned; this issue is closed by implementation of S-B9 (post-v1).

• Contract: new owner doc Import — Camera Import — the camera is a source adapter over PTP/IP (ISO 15740) feeding the unmodified import pipeline; deterministic handle enumeration; hash-on-receipt is the end-to-end integrity story (PTP/IP carries no checksums; TCP is transport-grade only) and that hash is what the signed manifest commits to; dedupe-on-reimport falls out of the planner's content-hash rule; camera storage is read-only (Sony's delete extension would gate on verify-before-destroy).
• Own library: confirmed — ptpip-rs, a new in-house portable Rust PTP/IP crate (libgphoto2 ruled out on portability + licensing), added to the SLICES library-gates table with a Sony-first vendor-extension seam.