feat(webui): add engine routes for Saves/Screenshots/Videos/Processes/Power/Users/SMP

[Twice6804]

Description

Phase 2 of browser-accessible ps5upload (#151, follow-up to #171): thin
axum handlers for the PS5-side screens whose Tauri commands previously
called ps5upload-core in-process with no HTTP equivalent, so the
browser web UI can drive Saves, Screenshots, Videos, Processes, Power
control/telemetry, and the SMP panel too.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Performance improvement
• Code refactoring

Changes Made

• engine/crates/ps5upload-engine/src/lib.rs: 9 new routes, each a direct spawn_blocking wrapper over an existing ps5upload-core function, following the exact pattern used by every other handler in the file:
  • GET /api/ps5/saves/list, GET /api/ps5/screenshots/list, GET /api/ps5/videos/list
  • GET /api/ps5/process/list, POST /api/ps5/process/kill
  • POST /api/ps5/power/control, GET /api/ps5/power/telemetry
  • GET /api/ps5/users/list
  • GET /api/ps5/smp/status
• engine/crates/ps5upload-core/src/smp.rs (new): moved the ShadowMount+ status-snapshot logic out of the Tauri shell into core, so both the desktop command and the new engine route share one implementation instead of drifting into two copies. client/src-tauri/src/commands/smp.rs is now a 3-line delegation to ps5upload_core::smp::collect_status.
• client/src/lib/browserInvoke.ts: matching cases for saves_list, screenshots_list, videos_list, process_list_get, process_kill_pid, power_reboot/power_shutdown/power_standby/power_tick, power_telemetry_get, user_list_get, smp_status.

Note: /api/ps5/process/list (process_mgr's detailed pid/name/title_id/memory/kind view with kill support) is intentionally distinct from the existing /api/ps5/proc/list (hw's lightweight PROC_LIST snapshot) — different core function, different struct shape.

Documentation Updates

Did you update the documentation? [ ] Yes [x] No

If no documentation updates: same reasoning as #171 — the self-hosted README section covering Dockerfile.webui + PS5UPLOAD_ALLOW_IP is planned once capability gating (hiding native-only affordances like local file pickers/save-to-USB in the browser) lands, so the docs describe one complete browser experience rather than piecemeal per-PR notes.

Testing

• npm run validate equivalent: typecheck, lint, full Vitest suite (72 files / 782 tests) — all green.
• npm run coverage
• Built PS5 payload successfully
• Cross-platform CI target checks passed
• Tested on real PS5 hardware
• Tested desktop app
• Verified all example commands in docs work — installed a working Rust toolchain (system rustc was too old for this dependency tree, same issue noted in feat(webui): serve the full React client from the engine over HTTP #171), ran cargo build/cargo build --features webui/cargo test --workspace/cargo fmt --check/cargo clippy (all clean), then started the engine locally and curled all 9 new routes: confirmed correct request parsing, 502 on unreachable PS5, 422 on a missing required field, 400 on an invalid power action, and that SMP status never hard-fails (per-probe errors land in the errors[] array as designed).
• Tested edge cases and error handling — confirmed the moved SMP tests (6 unit tests) still pass under ps5upload-core, and that /api/ps5/process/list doesn't collide with the pre-existing /api/ps5/proc/list.

Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have updated the documentation to reflect my changes
• My changes generate no new warnings
• I have tested my changes on PS5 hardware (or simulated environment)
• All example code in documentation has been tested and works

Additional Notes

Couldn't compile the Tauri desktop shell locally (missing system GTK/WebKit dev libraries, no sudo access in this environment) to verify client/src-tauri/src/commands/smp.rs directly — it's a 3-line delegation matching the exact error-conversion pattern used by every sibling command in the same file (saves_screenshots.rs, process_mgr.rs, system_power.rs), and the underlying ps5upload_core::smp::collect_status it calls is fully compiled and tested via the engine crate.

Remaining before the browser web UI is "complete": capability gating (hide host-filesystem-only features — local pickers, save-to-USB archive zip/unzip, payload send from a local file — when !isTauriEnv()) and the README self-hosted docs section.

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