Shorten Actions packaging retention so caches stop blocking the next release

[baseGame]

Summary

Repo Actions cache is already ~5.5 GB of 10 GB, mostly leftover rustc/cargo snapshots from old PRs and the v1.1.0 tag build. This change reclaims that space before packaging and stops new workflow artifacts from lingering.

.github/workflows/release.yml now exposes four workflow_dispatch parameters (same 1-day / keep-final defaults on v* tag pushes):

Input	UI label	Default
tenant_snapshot_retention_days	租户构建快照保留期（天）	'1'
installer_artifact_retention_days	三端安装包 Artifact 保留期（天）	'1'
initial_evidence_retention_days	初始发布证据保留期（天）	'1'
keep_final_evidence	保持最终证据（GitHub Release 安装包，勿删）	true

What is deleted (Actions storage only):

• A new prune-storage job runs first (actions: write). Other jobs needs it.
• All caches on refs/pull/*
• Caches older than tenant_snapshot_retention_days (default 1 day)
• Extra rust caches on master/main: keep only the newest rust cache per OS+job
• Expired / leftover workflow artifacts (installers, evidence, other Actions artifacts)

What is never deleted:

• GitHub Release download assets (DMG/DEB/RPM/MSI)
• The published release is not drafted, the tag is not deleted, and assets are not expired
• keep_final_evidence: true is the default and the prune job never calls the Releases API

Build jobs still restore rust/pnpm caches. tauri-apps/tauri-action still publishes installers only to the GitHub Release (uploadWorkflowArtifacts is left unset / false). Initial release evidence (run URL, platform list, checksums of that metadata) is uploaded with actions/upload-artifact and retention-days from initial_evidence_retention_days.

Type of change

• Bug fix
• New feature
• Documentation
• Refactor
• Build, CI, or release

Validation

• Parsed .github/workflows/release.yml and syntax-checked the inline Node prune/evidence scripts

• Did not run corepack pnpm quality / corepack pnpm test — this repo does not test workflow YAML, and no application code changed

• Did not bump the version, retag, or change Windows ssh2 / Intel macOS packaging

• corepack pnpm quality

• corepack pnpm test

Screenshots or recordings

N/A — workflow YAML only. After merge, Actions → Release → Run workflow shows the four Chinese-labeled inputs.

Checklist

• I kept the change focused.
• I added or updated tests where needed.
• I updated documentation for user-facing changes.
• I checked that no sensitive data is included.