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/schemas/__init__.py

@@ -0,0 +1,18 @@
+"""Pydantic schemas (request/response)."""
+
+from app.schemas.audit import AuditLogRead
+from app.schemas.auth import LoginRequest, TokenResponse
+from app.schemas.server import ServerCreate, ServerRead, ServerUpdate
+from app.schemas.update import JobTriggerRequest, UpdateJobRead, UpdateLogRead
+
+__all__ = [
+    "AuditLogRead",
+    "LoginRequest",
+    "TokenResponse",
+    "ServerCreate",
+    "ServerRead",
+    "ServerUpdate",
+    "JobTriggerRequest",
+    "UpdateJobRead",
+    "UpdateLogRead",
+]