Add refresh token auth routes and utilities

surfsense_backend/app/schemas/auth.py

@@ -0,0 +1,23 @@
+"""Authentication schemas for refresh token endpoints."""
+
+from pydantic import BaseModel
+
+
+class RefreshTokenResponse(BaseModel):
+    """Response from token refresh endpoint."""
+
+    access_token: str
+    refresh_token: str
+    token_type: str = "bearer"
+
+
+class LogoutResponse(BaseModel):
+    """Response from logout endpoint (current device)."""
+
+    detail: str = "Successfully logged out"
+
+
+class LogoutAllResponse(BaseModel):
+    """Response from logout all devices endpoint."""
+
+    detail: str = "Successfully logged out from all devices"