[BE] chore(#53): Swagger 설정

* Swagger Info, Servers, SecurityScheme 설정

Author: rndudals

backend/src/main/java/com/example/backend/auth/config/swagger/SwaggerConfig.java

@@ -0,0 +1,52 @@
+package com.example.backend.auth.config.swagger;
+
+import io.swagger.v3.oas.models.Components;
+import io.swagger.v3.oas.models.OpenAPI;
+import io.swagger.v3.oas.models.info.Contact;
+import io.swagger.v3.oas.models.info.Info;
+import io.swagger.v3.oas.models.info.License;
+import io.swagger.v3.oas.models.security.SecurityRequirement;
+import io.swagger.v3.oas.models.security.SecurityScheme;
+import io.swagger.v3.oas.models.servers.Server;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+
+@Configuration
+public class SwaggerConfig {
+
+    @Bean
+    public OpenAPI openAPI(@Value("${gitudyCoreUrls}") String[] serverList) {
+        Info info = new Info()
+                .title("Gitudy Server")
+                .version("0.1")
+                .description("깃터디 서버 API 문서입니다.")
+                .contact(new Contact()
+                        .name("📍 깃터디 GitHub Link")
+                        .url("https://github.com/DKU-Dgaja/gitudy"))
+                .license(new License()
+                        .name("⚖️ Apache License Version 2.0")
+                        .url("http://www.apache.org/licenses/LICENSE-2.0"));
+
+        List<Server> servers = Arrays.stream(serverList)
+                .map((url) -> new Server().url(url))
+                .collect(Collectors.toList());
+
+        SecurityScheme securityScheme = new SecurityScheme()
+                .name("Bearer Authentication")
+                .type(SecurityScheme.Type.HTTP)
+                .bearerFormat("JWT")
+                .scheme("Bearer");
+        SecurityRequirement schemaRequirement = new SecurityRequirement().addList("bearerAuth");
+
+        return new OpenAPI()
+                .components(new Components().addSecuritySchemes("bearerAuth", securityScheme))
+                .security(Arrays.asList(schemaRequirement))
+                .info(info)
+                .servers(servers);
+    }
+}