refactor(db): port operations, settings, audit, and misc metadata to sqlc (#84)

* refactor(db): port operations, settings, audit, activity, and misc service metadata to sqlc

Covers the cross-cutting surface: operations board reads, app settings,
notification producers, activity/audit inserts, builds upsert/cancel,
git clone credential resolution, invites, environments, registry auth,
project/service variables, HA resolver, boot sweeps, and admin user ops.
Dynamic filtered lists and Better Auth table probes stay raw by design.

Authored By: TDvorak <[email protected]>

* refactor(db): port apwhy gateway handlers and proxy data plane to sqlc

Final tranche — every static call site now uses generated queries. Raw SQL
remains only where the statement is assembled at runtime (filtered lists,
sparse updates, admin count closure) or probes Better Auth's auth_users
table, which lives outside the local schema.

Authored By: TDvorak <[email protected]>

app/backend/sqlc/queries/audit.sql

@@ -0,0 +1,28 @@
+-- name: InsertAuditLog :exec
+INSERT INTO audit_logs (id, user_id, resource, resource_id, action, details, severity, category, label, created_at)
+VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10);
+
+-- name: InsertAuditLogWithRequest :exec
+INSERT INTO audit_logs (id, user_id, resource, resource_id, action, details, ip_address, user_agent, severity, category, label, created_at)
+VALUES ($1, $2, $3, $4, $5, $6::jsonb, $7::inet, $8, $9, $10, $11, $12);
+
+-- name: PruneAuditLogs :execrows
+DELETE FROM audit_logs WHERE created_at < NOW() - ($1::int * INTERVAL '1 day');
+
+-- name: ListAuditBackfillBatch :many
+SELECT id::text, resource, action FROM audit_logs
+WHERE label = '' AND id > $1::uuid ORDER BY id LIMIT 500;
+
+-- name: SetAuditLogMetadata :exec
+UPDATE audit_logs SET severity = $1, category = $2, label = $3 WHERE id = $4::uuid;
+
+-- name: ListResourceAuditLogs :many
+SELECT id, COALESCE(user_id::text, '')::text AS user_id, resource,
+       COALESCE(resource_id::text, '')::text AS resource_id, action,
+       COALESCE(details::text, '{}')::text AS details,
+       COALESCE(ip_address::text, '')::text AS ip_address,
+       COALESCE(user_agent, '') AS user_agent, created_at
+FROM audit_logs
+WHERE user_id::text = $1 AND resource = $2 AND resource_id::text = $3
+ORDER BY created_at DESC
+LIMIT 100;