feat: selective starred repo mirroring with autoMirrorStarred toggle (#208)

* feat: add autoMirrorStarred toggle for selective starred repo mirroring (#205)

Add `githubConfig.autoMirrorStarred` (default: false) to control whether
starred repos are included in automatic mirroring operations. Manual
per-repo actions always work regardless of this toggle.

Bug fixes:
- Cleanup service no longer orphans starred repos when includeStarred is
  disabled (prevents data loss)
- First-boot auto-start now gates initial mirror behind autoMirror config
  (previously mirrored everything unconditionally)
- "Mirror All" button now respects autoMirrorStarred setting
- Bulk mirror and getAvailableActions now include pending-approval status

Changes span schema, config mapping, env loader, scheduler, cleanup
service, UI settings toggle, and repository components.

* fix: log activity when repos are auto-imported during scheduled sync

Auto-discovered repositories (including newly starred ones) were inserted
into the database without creating activity log entries, so they appeared
in the dashboard but not in the activity log.

* ci: set 10-minute timeout on all CI jobs

docs/ENVIRONMENT_VARIABLES.md

@@ -78,6 +78,7 @@ Settings for connecting to and configuring GitHub repository sources.
 | Variable | Description | Default | Options |
 |----------|-------------|---------|---------|
 | `SKIP_STARRED_ISSUES` | Enable lightweight mode for starred repos (skip issues) | `false` | `true`, `false` |
+| `AUTO_MIRROR_STARRED` | Automatically mirror starred repos during scheduled syncs and "Mirror All". When `false`, starred repos are imported for browsing but must be mirrored individually. | `false` | `true`, `false` |
 
 ## Gitea Configuration