feat: consolidate env config and add deployment files

- Add debug_font_path, demo_docs_dir, e2e_api_base_url to config.py
- Fix hardcoded paths in pp_structure_debug.py, create_demo_images.py
- Fix hardcoded paths in test files
- Update .env.example with new configuration options
- Update .gitignore to exclude AI development files (.claude/, openspec/, AGENTS.md, CLAUDE.md)
- Add production startup script (start-prod.sh)
- Add README.md with project documentation
- Add 1panel Docker deployment files (docker-compose.yml, Dockerfiles, nginx.conf)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/.env.example

@@ -5,3 +5,7 @@
 # For local development: http://localhost:8000
 # For WSL2: Use the WSL2 IP address (get with: hostname -I | awk '{print $1}')
 VITE_API_BASE_URL=http://localhost:8000
+
+# Dev server configuration (used by `vite.config.ts`)
+FRONTEND_HOST=0.0.0.0
+FRONTEND_PORT=5173