feat(core): add system settings routes

app/routes/system_settings.py

@@ -0,0 +1,50 @@
+"""System settings routes — get and upsert (admin only)."""
+
+from __future__ import annotations
+
+import uuid
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.core.auth import check_permission
+from app.core.db import get_db
+from app.deps import get_current_user
+from app.schemas.system_settings import SystemSettingsUpsert
+from app.services import system_settings_service
+
+router = APIRouter(prefix="/api/v1/system-settings", tags=["system-settings"])
+
+
+@router.get("")
+async def get_system_settings(
+    db: AsyncSession = Depends(get_db),
+    current_user: dict = Depends(get_current_user),
+):
+    """Get system settings for the current tenant."""
+    tenant_id = uuid.UUID(current_user["tenant_id"])
+    result = await system_settings_service.get_system_settings(db, tenant_id)
+    if result is None:
+        return {}
+    return result
+
+
+@router.put("")
+async def upsert_system_settings(
+    body: SystemSettingsUpsert,
+    db: AsyncSession = Depends(get_db),
+    current_user: dict = Depends(get_current_user),
+):
+    """Upsert system settings. Requires admin permission."""
+    tenant_id = uuid.UUID(current_user["tenant_id"])
+    user_id = uuid.UUID(current_user["user_id"])
+    role = current_user.get("role", "viewer")
+
+    if not check_permission(role, "settings", "update"):
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail={"detail": "Insufficient permissions", "code": "forbidden"},
+        )
+
+    data = body.model_dump()
+    return await system_settings_service.upsert_system_settings(db, tenant_id, user_id, data)