docs: sync documentation with actual repo state; adapt for Gitea

- Remove all .github references (removed in 6c644dd but docs still referenced)
- Rewrite review-pr skill to use Gitea API instead of gh CLI
- Add gitea-pr.sh helper for Gitea API calls (view/diff/files/comments)
- Update project structure tree: add scripts/, .woodpecker.yml, ci-cd.md,
  status-update-checklist.md, commit-docs-reminder.sh, RESEARCH-SDD-TOOLS.md
- Fix skills count 14 → 15 (add create-skill to DOCS.md)
- Remove .github references from CONTRIBUTING.md, SECURITY.md, init-project
- Add GITEA_TOKEN to .env.example
- Update CI/CD placeholder in RECOMMENDATIONS.md to Woodpecker

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CONTRIBUTING.md

@@ -45,10 +45,9 @@ chore: update dependencies
 
 1. Create a feature branch from `main`
 2. Keep PRs focused — one concern per PR
-3. Fill in the PR template (`.github/PULL_REQUEST_TEMPLATE.md`)
-4. Ensure no secrets or credentials in the diff
-5. Update relevant documentation if behavior changes
-6. Request review from the appropriate owner
+3. Ensure no secrets or credentials in the diff
+4. Update relevant documentation if behavior changes
+5. Request review from the appropriate owner
 
 ### Branch Naming