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.

tmp_check_fk.py

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+import asyncio
+from sqlalchemy import text
+from sqlalchemy.ext.asyncio import create_async_engine
+DATABASE_URL = 'postgresql+asyncpg://scilit:scilit_prod_2026@postgres:5432/scilit'
+async def main():
+    engine = create_async_engine(DATABASE_URL)
+    async with engine.connect() as conn:
+        r = await conn.execute(text("SELECT column_name FROM information_schema.columns WHERE table_name = 'tenants' ORDER BY ordinal_position"))
+        cols = [row.column_name for row in r]
+        print('tenants cols:', cols)
+        r = await conn.execute(text("SELECT column_name FROM information_schema.columns WHERE table_name = 'users' ORDER BY ordinal_position"))
+        cols2 = [row.column_name for row in r]
+        print('users cols:', cols2)
+        # Get admin user
+        r = await conn.execute(text("SELECT id, email FROM users WHERE email = 'admin@scilit.cn'"))
+        u = r.first()
+        print(f'admin user id: {u.id}')
+        # List tenants
+        r = await conn.execute(text("SELECT id, name FROM tenants"))
+        for row in r:
+            print(f'  tenant: {row.id} {row.name}')
+    await engine.dispose()
+asyncio.run(main())