feat: синхронизация бэкенда с документацией (AGENT_TASK_BACKEND_SYNC)

- Добвлен @fastify/cookie и настройку httpOnly cookie для refresh token
- Добавлен префикс /api/v1 для auth, profile, tests, admin
- Скорректировано в Login: возвращать user (id, nickname, avatarUrl, role, emailVerified),
  ставить refreshToken в Set-Cookie
- Скорректировано в Logout: Bearer + cookie, пустое тело, 200 + { message }, очищать cookie
- Скорректировано в Refresh: token из cookie, пустое тело, 200 + { accessToken }, Set-Cookie
- Добавлено в getPrivateProfile: поля role и plan
- Скорректировано в Tests: score = количество правильных, ответ { score, totalQuestions, percentage }
- Добавлено в question_cache_meta: поля valid, retryCount, questionsGenerated
- Обновлены тесты

package-lock.json

@@ -8,6 +8,7 @@
       "name": "samreshu-backend",
       "version": "0.1.0",
       "dependencies": {
+        "@fastify/cookie": "^11.0.2",
         "@fastify/cors": "^10.0.0",
         "@fastify/helmet": "^12.0.0",
         "@fastify/rate-limit": "^10.0.0",
@@ -1180,6 +1181,42 @@
       "integrity": "sha512-NM8/P9n3XjXhIZn1lLhkFaACTOURQXjWhV4BA/RnOv8xvgqtqpAX9IO4mRQxSx1Rlo4tqzeqb0sOlruaOy3dug==",
       "license": "MIT"
     },
+    "node_modules/@fastify/cookie": {
+      "version": "11.0.2",
+      "resolved": "https://registry.npmjs.org/@fastify/cookie/-/cookie-11.0.2.tgz",
+      "integrity": "sha512-GWdwdGlgJxyvNv+QcKiGNevSspMQXncjMZ1J8IvuDQk0jvkzgWWZFNC2En3s+nHndZBGV8IbLwOI/sxCZw/mzA==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/fastify"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/fastify"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "cookie": "^1.0.0",
+        "fastify-plugin": "^5.0.0"
+      }
+    },
+    "node_modules/@fastify/cookie/node_modules/fastify-plugin": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/fastify-plugin/-/fastify-plugin-5.1.0.tgz",
+      "integrity": "sha512-FAIDA8eovSt5qcDgcBvDuX/v0Cjz0ohGhENZ/wpc3y+oZCY2afZ9Baqql3g/lC+OHRnciQol4ww7tuthOb9idw==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/fastify"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/fastify"
+        }
+      ],
+      "license": "MIT"
+    },
     "node_modules/@fastify/cors": {
       "version": "10.1.0",
       "resolved": "https://registry.npmjs.org/@fastify/cors/-/cors-10.1.0.tgz",