Normalize tag names before attaching them, reject names that are too short
after sanitization, and return 404 when removing tags not attached to the
resource.
Adds a per-team unique tag-name index and migrates duplicate tags onto the
kept record before creating the constraint.
Add CRUD tag endpoints (GET/POST/DELETE) as sub-resources for applications,
databases, and services. Add team-level GET /tags endpoint. Extend all
resource creation endpoints to accept an optional tags array.
Uses a shared HandlesTagsApi trait to avoid duplication across controllers.
Tags are race-safe via syncWithoutDetaching(), garbage-collected when orphaned,
and sanitized (strip_tags + lowercase).
