Add stateful service soft deletes

[techulus-agent]

Basecamp To-Do: https://app.basecamp.com/5890597/buckets/47439993/todos/9969726820

Summary

• Add soft-delete metadata to services and deletion-pinned volume backups.
• Route stateful deletes through an async backup-first workflow, retaining secrets, volumes, and backups until purge.
• Add restore workflow support, an expired deleted-service purge cron, active-service filters, and a Deleted services UI.

Verification

• pnpm exec biome check db/schema.ts db/queries.ts actions/projects.ts actions/backups.ts lib/backup-scheduler.ts lib/scheduler.ts lib/inngest/events/index.ts lib/inngest/events/service-deletion.ts lib/inngest/functions/index.ts lib/inngest/functions/service-deletion-workflow.ts app/api/projects/'[id]'/services/route.ts app/api/v1/agent/expected-state/route.ts components/service/service-canvas.tsx components/service/deleted-services-panel.tsx app/'(dashboard)'/dashboard/projects/'[slug]'/'[env]'/deleted/page.tsx app/'(dashboard)'/dashboard/projects/'[slug]'/'[env]'/services/'[serviceId]'/configuration/page.tsx
• pnpm exec tsc --noEmit