docs: major repository restructure for GitHub public release

- Create comprehensive README.md optimized for GitHub/SEO
- Consolidate deployment instructions into single DEPLOYMENT.md
- Add all standard GitHub documentation files:
  - CONTRIBUTING.md with development guidelines
  - CODE_OF_CONDUCT.md for community standards
  - SECURITY.md with vulnerability reporting
  - CHANGELOG.md following Keep a Changelog format
- Simplify deployment with single docker-compose.yml
- Remove complex deployment configurations (Swarm, Traefik)
- Add backup script for easy maintenance
- Update .github-mirror-exclude to hide complex configs
- Remove redundant documentation files

This prepares PicPeak as a professional open-source alternative
to PicDrop and Scrapbook.de with clear, simple deployment.

.gitea/workflows/mirror-to-github.yml

@@ -16,8 +16,8 @@ jobs:
 
       - name: Setup Git
         run: |
-          git config --global user.name "Gitea Mirror Bot"
-          git config --global user.email "[email protected]"
+          git config --global user.name "the-luap"
+          git config --global user.email "[email protected]"
 
       - name: Create filtered branch
         run: |
@@ -33,16 +33,24 @@ jobs:
           git rm -r --cached .claudedocs/ || true
           git rm -r --cached backend/data/ || true
           git rm -r --cached backend/storage/ || true
-          
+          git rm -r --cached .gitea/ || true
+          git rm -r --cached scripts/install-gitea-runner.sh || true
+          git rm -r --cached .drone* || true
+          git rm -r --cached .github-mirrow-exclude || true
+          git rm -r --cached .gitattributes-github || true
+          git rm -r --cached photo-sharing-prd.md || true
+          git rm -r --cached CLAUDE.md || true
+
+        
           # Commit the changes
           git commit -m "Remove sensitive files for GitHub mirror" || true
 
       - name: Push to GitHub
         env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_TOKEN: ${{ secrets.GITHUBTOKEN }}
         run: |
           # Add GitHub remote
-          git remote add github https://x-access-token:${GITHUB_TOKEN}@github.com/YOUR_GITHUB_USERNAME/YOUR_REPO_NAME.git
+          git remote add github https://x-access-token:${GITHUBTOKEN}@github.com/the-luap/picpeak.git
           
           # Force push the filtered branch to GitHub main
           git push github github-mirror:main --force