Add system settings management api

src/main/kotlin/top/fatweb/api/controller/system/SettingsController.kt

@@ -0,0 +1,33 @@
+package top.fatweb.api.controller.system
+
+import io.swagger.v3.oas.annotations.Operation
+import io.swagger.v3.oas.annotations.tags.Tag
+import org.springframework.web.bind.annotation.*
+import top.fatweb.api.entity.common.ResponseResult
+import top.fatweb.api.param.system.MailSettingsParam
+import top.fatweb.api.service.system.ISettingsService
+import top.fatweb.api.vo.system.SettingsVo
+
+/**
+ * System settings controller
+ *
+ * @author FatttSnake, fatttsnake@gmail.com
+ * @since 1.0.0
+ */
+@Tag(name = "系统设置", description = "系统设置相关接口")
+@RequestMapping("/system/settings")
+@RestController
+class SettingsController(
+    private val settingsService: ISettingsService
+) {
+    @Operation(summary = "获取全部设置")
+    @GetMapping
+    fun get(): ResponseResult<SettingsVo> = ResponseResult.success(data = settingsService.get())
+
+    @Operation(summary = "更新邮件设置")
+    @PutMapping("/mail")
+    fun updateMail(@RequestBody mailSettingsParam: MailSettingsParam): ResponseResult<Nothing> {
+        settingsService.updateMail(mailSettingsParam)
+        return ResponseResult.success()
+    }
+}