Promote as a real deployment; version state and scope dropdowns

Turns promotion into a first-class deployment (action='promote') so it lands
in the deployments UI with before/after content, per-server restart tracking,
and one-click rollback. Non-beta matching-scope servers get restart_state=
pending so the existing sweep drains and restarts them the same way drift does.

Also adds a per-version state (untested/tested/test-failed) so the upload
flow can visibly signal that a beta must land before promotion, and swaps
the scope-value text box for game/map dropdowns populated from the fleet.
Beta rollback at ready-promote is now labelled Reject and marks the version
test-failed.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/routes/api/deployments/[id]/rollback/+server.ts

@@ -0,0 +1,14 @@
+import { json } from '@sveltejs/kit';
+import { rollbackPromoteDeployment, RollbackError } from '$lib/server/fleet/rollback.js';
+
+export async function POST({ params }: { params: { id: string } }) {
+    try {
+        const result = await rollbackPromoteDeployment(params.id);
+        return json({ ok: true, result });
+    } catch (err) {
+        if (err instanceof RollbackError) {
+            return json({ ok: false, error: err.message, kind: err.kind }, { status: 409 });
+        }
+        throw err;
+    }
+}