fix: 修复 YAML 块语法 body 匹配失败问题

- normalize_yaml_body 函数在解析 JSON 前添加 trim() 处理，解决 YAML `|` 和 `>` 语法产生的前导空格问题
- 修复 multiple_login.yaml 中 response body 格式错误（YAML 对象改为 JSON 字符串）

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

mocks/v1/auth/multiple_login.yaml

@@ -0,0 +1,118 @@
+# 用户登录 - JSON 格式
+- name: "user_login_002"
+  request:
+    path: "/v1/auth/login"
+    method: "POST"
+    headers:
+      Content-Type: "application/json"
+      Authorization: "eyJhbGciOiJIUzI1NiIsInR5cCI6"
+      host: "127.0.0.1:8080"
+    body: >
+      {
+        "username": "user002",
+        "password": "password123"
+      }
+  response:
+    status: 200
+    headers:
+      Content-Type: "application/json"
+    body: |
+      {
+        "code": 0,
+        "message": "登录成功",
+        "data": {
+          "token": "eyJhbGciOiJIUzI1NiIsInR5cCI6",
+          "userId": 10002,
+          "username": "user002",
+          "role": "administrator"
+        }
+      }
+  settings:
+    delay_ms: 2000 # 模拟真实网络延迟
+
+- name: "user_login_003"
+  request:
+    path: "/v1/auth/login"
+    method: "POST"
+    headers:
+      Content-Type: "application/json"
+      Authorization: "eyJhbGciOiJIUzI1NiIsInR5cCI6"
+      host: "127.0.0.1:8080"
+    body: |
+      {
+        "username": "user003",
+        "password": "password123"
+      }
+  response:
+    status: 200
+    headers:
+      Content-Type: "application/json"
+    body: >
+      {
+        "code": 0,
+        "message": "登录成功",
+        "data": {
+          "token": "eyJhbGciOiJIUzI1NiIsInR5cCI6",
+          "userId": 10003,
+          "username": "user003",
+          "role": "administrator"
+        }
+      }
+  settings:
+    delay_ms: 2000 # 模拟真实网络延迟
+
+- name: "user_login_004"
+  request:
+    path: "/v1/auth/login"
+    method: "POST"
+    headers:
+      Content-Type: "application/json"
+      Authorization: "eyJhbGciOiJIUzI1NiIsInR5cCI6"
+      host: "127.0.0.1:8080"
+    body: |
+      {
+        "username": "user004",
+        "password": "password123"
+      }
+  response:
+    status: 200
+    headers:
+      Content-Type: "application/json"
+    body: |
+      {
+        "code": 0,
+        "message": "登录成功",
+        "data": {
+          "token": "eyJhbGciOiJIUzI1NiIsInR5cCI6",
+          "userId": 10004,
+          "username": "user004",
+          "role": "administrator"
+        }
+      }
+
+- name: "user_login_005"
+  request:
+    path: "/v1/auth/login"
+    method: "POST"
+    headers:
+      Content-Type: "application/json"
+      Authorization: "eyJhbGciOiJIUzI1NiIsInR5cCI6"
+      host: "127.0.0.1:8080"
+    body:
+      username: "user005"
+      password: "password123"
+  response:
+    status: 200
+    headers:
+      Content-Type: "application/json"
+    body: |
+      {
+        "code": 0,
+        "message": "登录成功",
+        "data": {
+          "token": "eyJhbGciOiJIUzI1NiIsInR5cCI6",
+          "userId": 10005,
+          "username": "user005",
+          "role": "administrator"
+        }
+      }