refactor(db): port sleep/wake sweeper to sqlc (#81)

Tranche 7 — all 11 raw sites in sleeper.go. Adds sleep_enabled and
sleep_idle_minutes to schema.sql and three runtime.sql queries:
ListSleepCandidates, GetServiceDomainText, GetServiceStatusText. Status
writes reuse SetServiceStatus; the wake loader reuses
GetServiceRuntimeWithOwner (the projects join is FK-safe).

Also drops a dead port read in handleServiceSleep that was loaded but
never used.

TestRuntimeLiveInvariants now covers the sweep filter and both text
lookups on live Postgres.

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app/backend/sqlc/queries/runtime.sql

@@ -45,3 +45,15 @@ UPDATE services SET published_port = $1 WHERE id = $2 AND published_port <> $1;
 
 -- name: SetServiceReplicas :exec
 UPDATE services SET replicas = $1, updated_at = $2 WHERE id = $3;
+
+-- name: ListSleepCandidates :many
+SELECT id, project_id, name, COALESCE(status,'') AS status,
+       COALESCE(sleep_idle_minutes, 15) AS sleep_idle_minutes
+FROM services
+WHERE sleep_enabled AND COALESCE(status,'') IN ('running','deployed','degraded','starting');
+
+-- name: GetServiceDomainText :one
+SELECT COALESCE(domain,'') AS domain FROM services WHERE id = $1;
+
+-- name: GetServiceStatusText :one
+SELECT COALESCE(status,'') AS status FROM services WHERE id = $1;