Add complete project structure and all files

backend/.dockerignore

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+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+*.egg-info/
+dist/
+build/
+*.egg
+
+# Virtual environments
+venv/
+env/
+ENV/
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# Tests
+tests/
+*.test.py
+.pytest_cache/
+.coverage
+htmlcov/
+
+# Logs
+*.log
+logs/
+
+# Environment
+.env.local
+.env.*.local
+
+# Git
+.git/
+.gitignore
+
+# Documentation
+*.md
+docs/
+
+# Temporary files
+*.tmp
+*.bak
+*.cache