feat: add project scanner with full-drive mode

src/app/api/scan/route.ts

@@ -0,0 +1,44 @@
+import { NextResponse } from 'next/server';
+
+import { scanForProjects } from '../../../lib/scanner';
+import type { ScanMode } from '../../../lib/scanner';
+
+export const runtime = 'nodejs';
+
+function parseMode(value: string | null): ScanMode {
+  if (!value || value === 'default') {
+    return 'default';
+  }
+
+  if (value === 'full-drive') {
+    return 'full-drive';
+  }
+
+  throw new Error('Invalid scan mode. Use mode=default or mode=full-drive.');
+}
+
+function parseDepth(value: string | null): number | undefined {
+  if (!value) {
+    return undefined;
+  }
+
+  const parsed = Number.parseInt(value, 10);
+  if (!Number.isFinite(parsed) || parsed < 0) {
+    throw new Error('Depth must be a non-negative integer.');
+  }
+
+  return parsed;
+}
+
+export async function GET(request: Request): Promise<Response> {
+  try {
+    const url = new URL(request.url);
+    const mode = parseMode(url.searchParams.get('mode'));
+    const maxDepth = parseDepth(url.searchParams.get('depth'));
+    const result = await scanForProjects({ mode, maxDepth });
+    return NextResponse.json(result, { status: 200 });
+  } catch (error) {
+    const message = error instanceof Error ? error.message : 'Failed to scan projects.';
+    return NextResponse.json({ error: message }, { status: 400 });
+  }
+}