feat: 集成 SpringDoc OpenAPI + Swagger UI 文档页面

- 添加 springdoc-openapi-starter-webmvc-ui 2.5.0
- OpenApiConfig 配置 API 标题、描述、版本、认证方案
- 文档包含 Bearer Token 和 HMAC 签名两种认证说明
- Swagger UI: /swagger-ui.html
- OpenAPI JSON: /v3/api-docs

pom.xml

@@ -31,6 +31,7 @@
         <commons-codec.version>1.17.0</commons-codec.version>
         <hutool.version>5.8.27</hutool.version>
         <flyway.version>10.15.0</flyway.version>
+        <springdoc.version>2.5.0</springdoc.version>
     </properties>
 
     <dependencyManagement>
@@ -109,6 +110,13 @@
                 <artifactId>flyway-mysql</artifactId>
                 <version>${flyway.version}</version>
             </dependency>
+
+            <!-- SpringDoc OpenAPI -->
+            <dependency>
+                <groupId>org.springdoc</groupId>
+                <artifactId>springdoc-openapi-starter-webmvc-ui</artifactId>
+                <version>${springdoc.version}</version>
+            </dependency>
         </dependencies>
     </dependencyManagement>