Add backend version update check via GitHub Tags API + GHCR image verification

[Copilot]

The project lacked a backend mechanism to check for new releases and surface update notifications in the UI.

Changes

src/utils/VersionChecker.js (new)

• getCurrentVersion() — reads from process.env.VERSION (Docker build injection) or package.json
• fetchTags() — queries GitHub Tags API, filters v* tags (excludes preview-*), sorts descending by semver
• checkDockerImageExists(tag) — verifies image availability on GHCR, handles OAuth token challenge flow
• checkForUpdates() — returns { current, hasUpdate, latest, releaseUrl }, only reports an update when the corresponding Docker image is actually available

src/routes/StatusRoutes.js

• New authenticated GET /api/version/check endpoint
• Respects CHECK_UPDATE=false env var; returns { disabled: true } when opt-out

.env.example

• Documents CHECK_UPDATE=true

ui/app/pages/StatusPage.vue

• Calls /api/version/check on mount; renders version info card with update link when hasUpdate is true

Example response

// GET /api/version/check
{ "current": "0.7.1", "hasUpdate": true, "latest": "v0.8.0", "releaseUrl": "https://github.com/iBUHub/AIStudioToAPI/releases/tag/v0.8.0" }

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