feat: Function triggers — schedule, inbound hook, domain events

Migration 00016: function_id on scheduled_jobs/inbound_hooks,
event_pattern on functions, 'event' in the run-trigger enum.

- Jobs deliver to a function instead of HTTP when function_id is set;
  the run's status_code mirrors the process exit code. Clearing the
  field returns the job to URL delivery.
- Inbound hooks gain mode "function" — received body becomes stdin
  payload, acked immediately, run recorded async.
- event_pattern (document.*, *, exact type) fires the function detached
  on matching publishEvent — never blocks realtime/webhook fan-out.
- One executeFunction path serves manual/schedule/hook/event; run rows
  record the trigger source.
- Backend image now ships bun 1.3.14 so Functions work under compose.

Dashboard: job target picker, hook function mode, event-pattern field.

Verified live: job run → success (status_code 0), hook POST → run,
document.created → event run with correct payload.

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

apps/backend/internal/database/db/querier.go

@@ -112,6 +112,7 @@ type Querier interface {
 	ListEvents(ctx context.Context, arg ListEventsParams) ([]ListEventsRow, error)
 	ListFunctionRuns(ctx context.Context, arg ListFunctionRunsParams) ([]CoreFunctionRun, error)
 	ListFunctions(ctx context.Context, projectID uuid.UUID) ([]CoreFunction, error)
+	ListFunctionsForEvent(ctx context.Context, arg ListFunctionsForEventParams) ([]CoreFunction, error)
 	ListInboundHooks(ctx context.Context, projectID uuid.UUID) ([]CoreInboundHook, error)
 	ListIntegrations(ctx context.Context, projectID uuid.UUID) ([]CoreIntegration, error)
 	ListInvitationsForOrganization(ctx context.Context, organizationID uuid.UUID) ([]ListInvitationsForOrganizationRow, error)