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>

backend/tests/archived/test_ppstructure_params_performance.py

@@ -21,8 +21,9 @@ def ocr_service():
 @pytest.fixture
 def sample_image():
     """Find a sample image for testing"""
-    # Try to find any image in demo_docs
-    demo_dir = Path('/home/egg/project/Tool_OCR/demo_docs')
+    # Try to find any image in demo_docs (using settings for path)
+    from app.core.config import settings
+    demo_dir = Path(settings.demo_docs_dir)
     if demo_dir.exists():
         for ext in ['.pdf', '.png', '.jpg', '.jpeg']:
             images = list(demo_dir.glob(f'*{ext}'))