Add a second notice banner (because we need the first one to show the
current ToS update). Scoped to ap-southeast-1 and sa-east-1.
Haven't linked to the StatusPage maintenance entry yet as it's not up;
the placeholder link is just to the generic StatusPage.
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## Summary by CodeRabbit
* **New Features**
* Added a second notice banner that alerts users to upcoming maintenance
for affected databases in specific regions; it appears conditionally
(based on affected projects) and can be dismissed—dismissal prevents it
from reappearing.
* The existing “Updated Terms of Service” notice remains unchanged and
continues to display on non–sign-in routes until acknowledged.
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Charis
cf1e95dcd7