feat: V1.0.1 - Setup page, Docker, README

Add password-protected setup page (/api/setup) for DB initialization,
admin creation, and demo data seeding. Dockerize the full stack with
server, client, nginx reverse proxy, and MySQL services. Add project
README with architecture overview, quick start, and VPS deployment guide.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/config.py

@@ -31,6 +31,9 @@ class Settings(BaseSettings):
     ssl_certfile: str | None = None
     ssl_keyfile: str | None = None
 
+    # Setup page (empty = disabled)
+    setup_password: str | None = None
+
     @property
     def database_url(self) -> str:
         """Async MySQL connection string."""