feat: initial commit - oncology literature search platform

OncoLit: a multi-tenant oncology literature search, feed, and
collaboration platform. Built with FastAPI + Vue 3 + PostgreSQL.
Includes PubMed pipeline, drug approvals, AI summaries, and
systematic review tools.

.gitignore

@@ -0,0 +1,46 @@
+# Python
+__pycache__/
+*.py[cod]
+*.pyo
+*.egg-info/
+dist/
+build/
+.eggs/
+*.egg
+.venv/
+venv/
+.pytest_cache/
+.ruff_cache/
+.mypy_cache/
+.coverage
+htmlcov/
+
+# Node
+node_modules/
+frontend/dist/
+.pnpm-store/
+
+# IDE
+.vscode/settings.json
+.idea/
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Secrets
+.env
+*.key
+*.pem
+
+# Runtime data (token store, etc.)
+backend/data/
+
+# Database (PostgreSQL data dir - local only)
+/pgdata/
+
+# Logs
+*.log
+
+# Docker
+.dockerignore