fix: restore successful WSL release build for rust sensing server

[bilibili12433014]

Summary

This PR fixes the Rust release build failure documented in docs/user-guide.md when running cargo build --release inside WSL, and updates the guide to document the Linux desktop prerequisites required for the Rust source build.

Changes

• add the missing ruvector-mincut dependency to wifi-densepose-sensing-server
• fix multiple borrow-checker conflicts around tracker updates and field model calibration
• replace the stale adaptive classifier class reference with runtime model class names
• add a targeted dead_code compatibility workaround to avoid a rustc ICE observed in WSL builds
• update docs/user-guide.md with the Linux desktop prerequisite packages required by the desktop/Tauri build
• add a matching troubleshooting entry so the setup and recovery steps stay aligned

Verification

• reproduced the failure in WSL
• ran cargo build --release in rust-port/wifi-densepose-rs
• confirmed the build now completes successfully
• reviewed the updated guide to ensure the prerequisite command and troubleshooting section are context-consistent

Notes

• the remaining warnings are non-blocking and were not expanded in scope in this fix
• the documentation now includes the confirmed Linux desktop dependency packages needed for the documented build path
• this PR remains focused on restoring the documented release build path with minimal behavior changes

[bilibili12433014]

Hi @ruvnet, I reproduced the cargo build --release failure from docs/user-guide.md in WSL and fixed the issues in wifi-densepose-sensing-server that were blocking the release build. I also added a narrow workaround for the rustc ICE encountered in WSL and updated the guide with the required Linux desktop prerequisites. cargo build --release now succeeds. Could you please review when you have a chance?