feat: manage fruits — full CRUD with images and synonyms (story #02)

Backend: domain structs, FruitRepository interface + pg implementation,
9 Echo v4 handlers (list/get/create/update/delete, image sub-resources),
migration 000002 (fruit_type ENUM, fruits, fruit_synonyms, fruit_images),
route-scoped BodyLimit("5M") for uploads, http.DetectContentType for serving.

Frontend: typed fetch API layer, Pinia setup-style fruitStore, FruitList
(paginated), FruitCreate, and FruitDetail (edit + synonyms editor + image
gallery). 25 backend unit tests + integration test; 18 frontend tests.

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

frontend/src/router/index.ts

@@ -1,5 +1,8 @@
 import { createRouter, createWebHistory } from 'vue-router'
 import HelloWorld from '../views/HelloWorld.vue'
+import FruitList from '../views/FruitList.vue'
+import FruitCreate from '../views/FruitCreate.vue'
+import FruitDetail from '../views/FruitDetail.vue'
 
 const router = createRouter({
   history: createWebHistory(),
@@ -8,6 +11,20 @@ const router = createRouter({
       path: '/',
       component: HelloWorld,
     },
+    {
+      path: '/fruits',
+      component: FruitList,
+    },
+    {
+      // /fruits/new must come before /:id so vue-router v5 doesn't capture "new" as a param
+      path: '/fruits/new',
+      component: FruitCreate,
+    },
+    {
+      path: '/fruits/:id',
+      component: FruitDetail,
+      props: true,
+    },
   ],
 })