feat: add public search controls

Add public category lookup options, allowlisted sort ordering, URL-backed catalog controls, and strict search route validation with regression tests.

apps/api/tests/http/public-search-routes.test.js

@@ -10,6 +10,7 @@ test('returns public search results with pagination metadata', async (testContex
         assert.equal(filters.page, 2);
         assert.equal(filters.limit, 5);
         assert.equal(filters.includeSold, true);
+        assert.equal(filters.sort, 'price_low');
         return {
           items: [{ id: 'listing-1', status: 'CLOSED' }],
           pagination: { page: 2, limit: 5, total: 6, totalPages: 2 },
@@ -21,7 +22,7 @@ test('returns public search results with pagination metadata', async (testContex
 
   const response = await app.inject({
     method: 'GET',
-    url: '/api/v1/public/search?query=charizard&page=2&limit=5&includeSold=true',
+    url: '/api/v1/public/search?query=charizard&page=2&limit=5&includeSold=true&sort=price_low',
   });
 
   assert.equal(response.statusCode, 200);
@@ -45,4 +46,17 @@ test('rejects malformed numeric search filters', async (testContext) => {
 
   assert.equal(response.statusCode, 400);
   assert.equal(response.json().error.code, 'INVALID_SEARCH_FILTER');
+});
+
+test('returns active public category options', async (testContext) => {
+  const app = buildApp({
+    catalogLookupRepository: {
+      async listCategories() { return [{ id: 'category-1', name: 'Trading Cards' }]; },
+    },
+  });
+  testContext.after(() => app.close());
+
+  const response = await app.inject({ method: 'GET', url: '/api/v1/public/lookups/categories' });
+  assert.equal(response.statusCode, 200);
+  assert.deepEqual(response.json().data, [{ id: 'category-1', name: 'Trading Cards' }]);
 });