changed.velopack，试试rust

.trae/specs/velopack-update-integration/checklist.md

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+# Checklist
+
+- [x] `releases.win.json` recognized by host update download flow.
+- [x] Launcher pending update check supports VeloPack payload.
+- [x] Launcher apply uses deployment markers (`.current/.partial/.destroy`) unchanged.
+- [x] Legacy script path retained as emergency fallback.
+- [ ] Staging verification report attached.

.trae/specs/velopack-update-integration/spec.md

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+# VeloPack Update Integration
+
+## Goal
+Switch incremental package generation and release assets to VeloPack native outputs while keeping Launcher as the update installer and rollback authority.
+
+## Requirements
+- CI/release pipeline produces `releases.win.json` and `*.nupkg` assets for Windows x64.
+- Launcher can detect pending VeloPack payload in `.launcher/update/incoming`.
+- Launcher applies update into new `app-*` deployment and preserves rollback snapshot behavior.
+- Existing launcher responsibilities (OOBE/startup/plugin upgrade) remain unchanged.
+
+## Acceptance
+- Build and quality workflows pass after migration changes.
+- Release workflow publishes VeloPack assets.
+- Launcher `update apply` succeeds with VeloPack full package payload.
+- Manual rollback still works after a VeloPack-based update.

.trae/specs/velopack-update-integration/tasks.md

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+# Tasks
+
+- [x] Fix Launcher `LoadingDetailsWindow.axaml` compile regression.
+- [x] Add VeloPack feed/package model support in Launcher update engine.
+- [x] Keep legacy delta flow behind disabled fallback switch.
+- [x] Migrate release workflow packaging assets to VeloPack outputs.
+- [x] Update host-side update workflow to download VeloPack payload files.
+- [ ] Run full release workflow dry-run on GitHub and validate artifacts.
+- [ ] Validate end-to-end update + rollback on a staging machine.