feat: 算力引擎 Go 后端核心（new-api）

- 统一 OpenAI 兼容 /v1 中继 + 渠道/额度/令牌/流水
- 各领域包：relay 模型网关、model 数据层、controller 管理 API

controller/system_task.go

@@ -0,0 +1,117 @@
+package controller
+
+import (
+	"net/http"
+	"strconv"
+
+	"github.com/QuantumNous/new-api/common"
+	"github.com/QuantumNous/new-api/model"
+	"github.com/QuantumNous/new-api/service"
+
+	"github.com/gin-gonic/gin"
+)
+
+func CreateLogCleanupSystemTask(c *gin.Context) {
+	targetTimestamp, _ := strconv.ParseInt(c.Query("target_timestamp"), 10, 64)
+	if targetTimestamp == 0 {
+		c.JSON(http.StatusOK, gin.H{
+			"success": false,
+			"message": "target timestamp is required",
+		})
+		return
+	}
+
+	task, err := service.StartLogCleanupTask(targetTimestamp)
+	if err != nil {
+		common.ApiError(c, err)
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{
+		"success": true,
+		"message": "",
+		"data":    task.ToResponse(),
+	})
+}
+
+func GetCurrentSystemTask(c *gin.Context) {
+	taskType := c.Query("type")
+	if taskType == "" {
+		c.JSON(http.StatusOK, gin.H{
+			"success": false,
+			"message": "type is required",
+		})
+		return
+	}
+
+	task, err := model.GetActiveSystemTask(taskType)
+	if err != nil {
+		common.ApiError(c, err)
+		return
+	}
+	if task == nil {
+		c.JSON(http.StatusOK, gin.H{
+			"success": true,
+			"message": "",
+			"data":    nil,
+		})
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{
+		"success": true,
+		"message": "",
+		"data":    task.ToResponse(),
+	})
+}
+
+func ListSystemTasks(c *gin.Context) {
+	limit, _ := strconv.Atoi(c.Query("limit"))
+
+	tasks, err := model.ListSystemTasks(limit)
+	if err != nil {
+		common.ApiError(c, err)
+		return
+	}
+
+	responses := make([]model.SystemTaskResponse, 0, len(tasks))
+	for _, task := range tasks {
+		responses = append(responses, task.ToResponse())
+	}
+
+	c.JSON(http.StatusOK, gin.H{
+		"success": true,
+		"message": "",
+		"data":    responses,
+	})
+}
+
+func GetSystemTask(c *gin.Context) {
+	taskID := c.Param("task_id")
+	if taskID == "" {
+		c.JSON(http.StatusOK, gin.H{
+			"success": false,
+			"message": "task id is required",
+		})
+		return
+	}
+
+	task, err := model.GetSystemTaskByTaskID(taskID)
+	if err != nil {
+		common.ApiError(c, err)
+		return
+	}
+	if task == nil {
+		c.JSON(http.StatusNotFound, gin.H{
+			"success": false,
+			"message": "task not found",
+		})
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{
+		"success": true,
+		"message": "",
+		"data":    task.ToResponse(),
+	})
+}