Add autoscaling dry run and policy controls

src/routes/api/autoscaling/+server.ts

@@ -0,0 +1,15 @@
+import { json } from '@sveltejs/kit';
+import { previewScaling, saveScaling, scalingReport, setScalingGlobalPause, ScalingError } from '$lib/server/autoscaling/index.js';
+
+export function GET() { return json(scalingReport()); }
+export async function POST({ request }: { request: Request }) {
+    try {
+        const body = await request.json();
+        if (!body || typeof body !== 'object' || Array.isArray(body)) throw new ScalingError('Provide a policy action.');
+        if (body.id !== undefined && typeof body.id !== 'string') throw new ScalingError('Invalid policy identity.');
+        if (body.action === 'preview') return json(previewScaling(body.settings, body.id, body.revision));
+        if (body.action === 'save') return json({ policy: saveScaling(body.settings, body.id, body.revision, body.token) });
+        if (body.action === 'global-pause' && typeof body.paused === 'boolean') { setScalingGlobalPause(body.paused); return json({ ok: true }); }
+        throw new ScalingError('Choose a supported policy action.');
+    } catch (error) { return json({ error: (error as Error).message }, { status: error instanceof ScalingError ? error.status : 400 }); }
+}