feat: 实现配置加载系统与多级目录递归扫描

- 定义支持“一接口一文件”与“一文件多接口”的数据模型
- 实现基于路径首段的 HashMap 索引构建逻辑
- 新增集成测试 tests/integration_test.rs，验证 YAML 解析与目录递归加载
- 优化 Cargo.toml 配置，解决连字符项目名引用问题

mocks/v1/auth/login.yaml

@@ -0,0 +1,21 @@
+id: "auth_login_001"
+request:
+  method: "POST"
+  path: "/api/v1/auth/login"
+  # 必须包含此 Header 才会匹配
+  headers:
+    Content-Type: "application/json"
+response:
+  status: 200
+  headers:
+    Content-Type: "application/json"
+    X-Mock-Engine: "Rust-Gemini-v1.2"
+  # 直接内联 JSON 字符串
+  body: >
+    {
+      "code": 0,
+      "data": { "token": "eyJhbGciOiJIUzI1NiIsInR5cCI6" },
+      "msg": "success"
+    }
+settings:
+  delay_ms: 200 # 模拟真实网络延迟

mocks/v1/products/export.yaml

@@ -0,0 +1,11 @@
+id: "prod_export_pdf"
+request:
+  method: "GET"
+  path: "/api/v1/products/report"
+response:
+  status: 200
+  headers:
+    Content-Type: "application/pdf"
+    Content-Disposition: "attachment; filename=report.pdf"
+  # 智能协议：引擎会自动识别前缀并异步读取磁盘文件
+  body: "file://./storage/reports/annual_2024.pdf"

mocks/v1/system/health.yaml

@@ -0,0 +1,16 @@
+# 使用 YAML 数组语法定义多个规则
+- id: "sys_ping"
+  request:
+    method: "GET"
+    path: "/api/v1/ping"
+  response:
+    status: 200
+    body: "pong"
+
+- id: "sys_version"
+  request:
+    method: "GET"
+    path: "/api/v1/version"
+  response:
+    status: 200
+    body: '{"version": "1.2.0-smart"}'

mocks/v1/user/search.yaml

@@ -0,0 +1,11 @@
+id: "user_search_admin"
+request:
+  method: "GET"
+  path: "/api/v1/users"
+  # 请求中必须包含 role=admin 且 status=active
+  query_params:
+    role: "admin"
+    status: "active"
+response:
+  status: 200
+  body: '{"users": [{"id": 1, "name": "SuperAdmin"}]}'