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/auth.py

@@ -0,0 +1,22 @@
+"""Auth schemas."""
+
+from pydantic import BaseModel, Field
+
+
+class LoginRequest(BaseModel):
+    username: str = Field(min_length=1)
+    password: str = Field(min_length=1)
+
+
+class TokenResponse(BaseModel):
+    access_token: str
+    token_type: str = "bearer"
+    expires_in: int  # seconds
+
+
+class UserRead(BaseModel):
+    id: int
+    username: str
+    email: str | None
+    full_name: str | None
+    is_admin: bool