feat: fruit search by name/synonym and type filter (story #06)

Backend: List repo query gains name (ILIKE with wildcard escaping on
name + synonym LEFT JOIN, SELECT DISTINCT) and types (ANY cast) params;
handler parses ?name= and ?type=, resolves combined-type aliases from
domain.FruitTypeAliases, validates plain types against validFruitTypes
to prevent Postgres enum cast errors. ORDER BY f.name, f.id for stable
pagination.

Frontend: listFruits gains optional {name, type} params; fruitStore adds
searchName/searchType state and setSearch action (resets offset, refetches);
FruitList.vue wires text input (debounced 300 ms + Enter) and flat type
dropdown (17 enum values + 4 aliases per spec §5 order); debounce timer
cleared on unmount.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/api/fruits.test.ts

@@ -19,18 +19,17 @@ type MockResponse = {
 const fetchMock = vi.fn((url: string, init?: RequestInit): Promise<MockResponse> => {
   const method = init?.method ?? 'GET'
 
-  if (url === '/api/v1/fruits?limit=50&offset=0' && method === 'GET') {
+  if (url.startsWith('/api/v1/fruits?') && method === 'GET') {
+    const params = new URLSearchParams(url.split('?')[1])
     return Promise.resolve({
       ok: true,
       status: 200,
-      json: async () => ({ items: [], total: 0, limit: 50, offset: 0 }),
-    })
-  }
-  if (url === '/api/v1/fruits?limit=10&offset=20' && method === 'GET') {
-    return Promise.resolve({
-      ok: true,
-      status: 200,
-      json: async () => ({ items: [], total: 0, limit: 10, offset: 20 }),
+      json: async () => ({
+        items: [],
+        total: 0,
+        limit: Number(params.get('limit') ?? 50),
+        offset: Number(params.get('offset') ?? 0),
+      }),
     })
   }
   if (url === '/api/v1/fruits/1' && method === 'GET') {
@@ -99,9 +98,19 @@ describe('listFruits', () => {
   })
 
   it('passes custom limit and offset', async () => {
-    const result = await listFruits(10, 20)
+    const result = await listFruits({ limit: 10, offset: 20 })
     expect(result.offset).toBe(20)
   })
+
+  it('appends name param when provided', async () => {
+    await listFruits({ name: 'Boskop' })
+    expect(fetchMock).toHaveBeenLastCalledWith(expect.stringContaining('name=Boskop'))
+  })
+
+  it('appends type param when provided', async () => {
+    await listFruits({ type: 'Apfelsorten' })
+    expect(fetchMock).toHaveBeenLastCalledWith(expect.stringContaining('type=Apfelsorten'))
+  })
 })
 
 describe('getFruit', () => {