The error message for unsupported version deletion still referenced only
DRAFT/REJECTED. Updated both EN and ZH messages to reflect the actual
deletable statuses: DRAFT, UPLOADED, REJECTED, SCAN_FAILED.
Also updated OSS-02 design doc to mark all blocking items as completed.
## Summary
- Add UPLOADED status for PRIVATE skills after security scan passes
- PRIVATE skill owners can test before confirming publish or submitting for review
- Rerelease now follows visibility rules (PRIVATE→UPLOADED, PUBLIC→PENDING_REVIEW)
- Auto-withdraw changes status to UPLOADED (not DRAFT) to keep versions visible
## Changes
- SkillVersionStatus: Add UPLOADED enum value
- SkillPublishService: PRIVATE skills go to UPLOADED after scan
- SecurityScanService: Visibility-based status transition after scan
- SkillGovernanceService: Withdraw→UPLOADED, delete allows UPLOADED
- SkillQueryService: Include UPLOADED in version list filters
- SkillReviewSubmitService: New service for submit-review and confirm-publish
- SkillLifecycleController: Add submit-review and confirm-publish endpoints
- Frontend: Add buttons, dialogs, and hooks for new operations
## Workflow
- PRIVATE: Publish → SCANNING → UPLOADED → confirm-publish → PUBLISHED
- PUBLIC: Publish → SCANNING → PENDING_REVIEW → PUBLISHED
