agents.routes.ts approve handler: wrap prisma.instance.create in
try/catch. When a PrismaClientKnownRequestError P2002 with target
including 'slug' is thrown, convert to a 409 AppError with a clear
message directing the admin at DELETE /api/instances/:id or the new
scripts/ccp-deregister.sh on the target host.
Before this, re-registering a previously-registered host (after the
operator tore down the underlying stack without cleaning CCP's DB
row) returned 500 with a raw Prisma error string — the operator had
to read a stack trace to understand the cause. Now the error is
self-describing and points at the fix.
Matches the pattern other CCP error paths use.
Bunker Admin
bunker-admin
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