docs: update README and wiki for Gitea Actions migration
Replace all Gogs/Woodpecker references with Gitea/Gitea Actions:
README.md:
- CI badge → Gitea Actions workflow badge
- CI/CD section: Woodpecker → Gitea Actions (amd64 + arm64 runners)
- Project structure: .woodpecker/ → .gitea/workflows/
- Releases: arm64 now native (not QEMU)
- Phase 11/12 status updated
docs/wiki/Home.md:
- CI badge, tech stack, phase status updated
docs/wiki/Troubleshooting.md:
- Remove Woodpecker-specific items (JWT webhooks, orphan containers,
plugin-git switch failure, Gogs token quirks)
- Add Gitea Actions troubleshooting: container network, apt-get update,
job skip on tags, RELEASE_TOKEN, act_runner CONFIG_FILE requirement
Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>
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