Add get role controller. Optimize code.

src/main/kotlin/top/fatweb/api/param/authentication/RoleAddParam.kt

@@ -0,0 +1,16 @@
+package top.fatweb.api.param.authentication
+
+import io.swagger.v3.oas.annotations.media.Schema
+import jakarta.validation.constraints.NotBlank
+
+data class RoleAddParam(
+    @Schema(description = "角色名称")
+    @field:NotBlank
+    val name: String,
+
+    @Schema(description = "启用")
+    val enable: Boolean = true,
+
+    @Schema(description = "权限 ID 列表")
+    val powerIds: List<Long>? = null
+)