ui(databases): Manage servers and provision databases

[nfebe]

The database area saves server passwords in browser storage and hides database creation behind a connection detail view. Replace it with a server backed resource flow where users choose a server, create and manage its databases, and copy the connection details applications need.

Checklist

• List database servers from the agent instead of browser storage
• Deploy a database server from an infrastructure template or connect an existing server
• Show the databases and users inside each selected server
• Create a database with an optional dedicated user and privileges
• Show copy actions for the internal host, port, database name, username, and connection URL
• Show generated credentials once without persisting them in browser storage
• Gate read and mutation controls with database permissions
• Use the shared form, modal, table, empty state, and notification components in both themes
• Cover server selection and database provisioning through UI tests

Related

• feat: Add support for infrastructure deployment #55