api+ui: kind-scoped save/delete endpoints and links

API: /config/{services,jobs,tools,static}/{name} now pin the twin they
target — _save_deployment/_delete_deployment take an explicit kind so a
patch to a 'backup' service can't bleed into a 'backup' job/tool. Add
/tools and /static endpoints; keep /deployments/{name} kind-agnostic.
New test_kind_twins proves per-kind save/delete isolation on disk.

UI: ConfigPanel and CreateDeploymentForm write to the kind-scoped
resource; GatewayPanel/NodeDetail/DeploymentsSection link via a shared
detailPath(name, kind) helper instead of the ambiguous /deployment/:name.

Includes incidental ruff-format reflow of untouched api files.

app/src/pages/ServiceDetail.tsx

@@ -146,10 +146,6 @@ export function ServiceDetailPage() {
         </div>
       </div>
 
-      {deployment.systemd && (
-        <SystemdPanel name={deployment.id} systemd={deployment.systemd} />
-      )}
-
       {isGateway && caddyfile?.content && (
         <div className="bg-[var(--card)] border border-[var(--border)] rounded-lg p-5 mb-6">
           <h2 className="text-sm font-semibold text-[var(--muted)] uppercase tracking-wider mb-1">
@@ -170,6 +166,10 @@ export function ServiceDetailPage() {
         onRefetch={refetch}
       />
 
+      {deployment.systemd && (
+        <SystemdPanel name={deployment.id} systemd={deployment.systemd} />
+      )}
+
       {deployment.managed && (
         <div className="mb-6">
           <h2 className="text-lg font-semibold mb-3">Logs</h2>