Implement Containers, Cloud, and APIs environment component tabs

Problem

The Containers, Cloud, and APIs sub-tabs under environment details are placeholders. Users cannot manage these component types, associate them with environments, audit changes, or expose them as deployment variables.

Scope

• Add persistent models for containers, cloud resources, and API registrations, including environment mappings and audit records.
• Provide CRUD and environment attach/detach operations with explicit outcomes and conflict handling.
• Add typed API endpoints with environment-aware authorization and appropriate 403, 404, and 409 responses.
• Register the new persistence and resolver dependencies in the API and Monitor.
• Emit environment-level and per-tag deployment variables for attached components without changing variables for unaffected environments.
• Replace the placeholder UI tabs with grids and create, edit, attach, detach, and delete workflows.
• Gate write controls using the environment's edit permission.

Acceptance criteria

• Users can create, view, edit, attach, detach, and delete all three component types through the environment details UI.
• Every write operation is authorized and audited, including attach and detach actions.
• Concurrent or duplicate environment mappings return conflicts rather than false success responses.
• Attached components produce the documented deployment variables, including scalar or array per-tag name values as appropriate.
• Environments without attached components retain their existing deployment variable set unchanged.
• Deep links and cold-cache tab activation load the correct component data.
• Automated tests cover persistence, authorization, API outcomes, dependency registration, variable resolution, and UI behavior.

Rollout notes

• Deploy the database dacpac before the API and Monitor.
• Check existing properties for collisions with the new reserved deployment variable names and prefixes.
• Complete a deployed UI round-trip covering create, attach, edit, detach, and delete.

Implementation

Implemented by #773.