Initial scaffold: FastAPI backend + Vue 3 frontend + Docker setup

Backend: config/db/security/logging core, SQLAlchemy models (Server,
Credential, UpdateJob, UpdateLog, AuditLog, User), services (winrm, ssh,
cau, audit, job_runner), REST API (auth, servers, updates, audit),
Socket.io WebSocket layer.
Frontend: Vue 3 + TS + Pinia + Tailwind, Views (Dashboard, Servers,
Updates, Audit, Login), axios + socket.io-client, nginx prod config.

backend/app/models/__init__.py

@@ -0,0 +1,16 @@
+"""SQLAlchemy ORM models."""
+
+from app.models.audit_log import AuditLog
+from app.models.credential import Credential
+from app.models.server import Server
+from app.models.update_job import UpdateJob, UpdateLog
+from app.models.user import User
+
+__all__ = [
+    "AuditLog",
+    "Credential",
+    "Server",
+    "UpdateJob",
+    "UpdateLog",
+    "User",
+]