feat(phase-4a): backend skeleton, auth, health, tests

.gitignore

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+# Secrets and environment files
+.env
+.env.*
+!.env.example
+
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+*.egg-info/
+.eggs/
+build/
+dist/
+*.egg
+
+# Virtual environments
+.venv/
+venv/
+env/
+ENV/
+
+# Test and coverage
+.pytest_cache/
+.coverage
+.coverage.*
+htmlcov/
+coverage.xml
+.mypy_cache/
+.ruff_cache/
+
+# Database files
+*.db
+*.db-journal
+*.db-wal
+*.db-shm
+data/
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+.DS_Store
+
+# Logs
+*.log
+logs/
+
+# Alembic (autogenerated migrations excluded, but keep 0001)
+alembic/versions/__pycache__/
+
+# Frontend build artifacts (Phase 4c)
+webui/node_modules/
+webui/dist/
+
+# Docker
+.docker-data/
+
+# Test artifacts
+.pytest_cache/
+.coverage
+.coverage.*
+htmlcov/