feat: 实现域能系统

- 新增域能完整分层：EnergyLog/PostEnergizeLog/DailyExpSummary 模型、EnergyRepo、EnergyService、EnergyController/AdminEnergyController
- 支持签到获取域能(+1)、帖子赋能(-1/-2)/被赋能(+1/+2)、改名扣能(-6)/退款(+6)、删帖扣能(-2)
- 赋能单人单帖上限20域能，每日赋能获得经验上限50
- 管理员支持批量调整域能(owner)和查询域能日志(admin)
- LV0用户(exp<1)禁止签到和发帖，余额为负可签到/被赋能/删帖但不能赋能/改名
- 首次改名免费(通过HasCompletedTask判重)，改名扣能在提交审核时执行
- 移除导航栏手动签到按钮，签到融入域能系统(自动签到)
- 新增个人中心域能TAB展示余额和流水日志(近7天)
- 新增帖子详情页赋能按钮(轻赋/重赋)
- 管理后台新增域能管理和域能日志页面

internal/controller/admin/admin_energy_controller.go

@@ -0,0 +1,103 @@
+package admin
+
+import (
+	"net/http"
+	"strconv"
+
+	"metazone.cc/metalab/internal/common"
+	"metazone.cc/metalab/internal/model"
+
+	"github.com/gin-gonic/gin"
+)
+
+// adminEnergyUseCase AdminEnergyController 对 EnergyService 的最小依赖（ISP：2 个方法）
+type adminEnergyUseCase interface {
+	AdminAdjust(operatorUID uint, userIDs []uint, amount int, description string) error
+	GetAdminEnergyLogs(energyType string, page, pageSize int) ([]model.EnergyLog, int64, error)
+}
+
+// AdminEnergyController 后台域能管理控制器
+type AdminEnergyController struct {
+	energySvc adminEnergyUseCase
+}
+
+// NewAdminEnergyController 构造函数
+func NewAdminEnergyController(energySvc adminEnergyUseCase) *AdminEnergyController {
+	return &AdminEnergyController{energySvc: energySvc}
+}
+
+// EnergyPage 域能管理页面
+func (ac *AdminEnergyController) EnergyPage(c *gin.Context) {
+	c.HTML(http.StatusOK, "admin/energy/index.html", common.BuildAdminPageData(c, gin.H{
+		"Title": "域能管理",
+	}))
+}
+
+// EnergyLogPage 域能日志页面
+func (ac *AdminEnergyController) EnergyLogPage(c *gin.Context) {
+	c.HTML(http.StatusOK, "admin/energy/logs.html", common.BuildAdminPageData(c, gin.H{
+		"Title": "域能日志",
+	}))
+}
+
+// AdjustEnergy 调整用户域能
+func (ac *AdminEnergyController) AdjustEnergy(c *gin.Context) {
+	operatorUID, ok := c.Get("uid")
+	if !ok {
+		common.Error(c, http.StatusUnauthorized, "请先登录")
+		return
+	}
+
+	var req struct {
+		UserIDs     []uint `json:"user_ids" binding:"required,min=1"`
+		Amount      int    `json:"amount" binding:"required"`
+		Description string `json:"description" binding:"required,min=1,max=500"`
+	}
+	if err := c.ShouldBindJSON(&req); err != nil {
+		common.Error(c, http.StatusBadRequest, "参数错误：需要 user_ids、amount 和 description")
+		return
+	}
+
+	if err := ac.energySvc.AdminAdjust(operatorUID.(uint), req.UserIDs, req.Amount, req.Description); err != nil {
+		common.Error(c, http.StatusInternalServerError, "调整失败")
+		return
+	}
+
+	common.OkMessage(c, "域能调整成功")
+}
+
+// ListEnergyLogs 查询域能日志
+func (ac *AdminEnergyController) ListEnergyLogs(c *gin.Context) {
+	energyType := c.Query("type")
+	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
+	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))
+
+	logs, total, err := ac.energySvc.GetAdminEnergyLogs(energyType, page, pageSize)
+	if err != nil {
+		common.Error(c, http.StatusInternalServerError, "查询失败")
+		return
+	}
+
+	// 转换为展示友好的视图
+	type logView struct {
+		model.EnergyLog
+		EnergyDisplay float64 `json:"energy_display"`
+		TypeName      string  `json:"type_name"`
+	}
+	views := make([]logView, len(logs))
+	for i, l := range logs {
+		views[i] = logView{
+			EnergyLog:     l,
+			EnergyDisplay: float64(l.Amount) / 10,
+			TypeName:      model.EnergyLogDisplayNames[l.Type],
+		}
+	}
+
+	common.Ok(c, gin.H{
+		"items":       views,
+		"total":       total,
+		"page":        page,
+		"page_size":   pageSize,
+		"total_pages": common.PageCount(total, pageSize),
+	})
+}