refactor: 文件行数超标拆解（7个文件→14个文件，全部≤200行）

- 移动本地接口定义到 interfaces.go 和 admin/interfaces.go
- favorite_controller.go → favorite_item_controller.go
- space_controller.go → space_loaders.go
- settings_controller.go → settings_api_audit.go
- admin_energy_controller.go → admin_energy_api_controller.go
- admin_post_controller.go → admin_post_action_controller.go
- comment_repo.go → comment_mention_repo.go
- post_repo.go → post_stats_repo.go

internal/controller/admin/admin_post_action_controller.go

@@ -0,0 +1,124 @@
+package admin
+
+import (
+	"errors"
+	"net/http"
+	"strconv"
+
+	"metazone.cc/metalab/internal/common"
+	"metazone.cc/metalab/internal/model"
+
+	"github.com/gin-gonic/gin"
+)
+
+// Approve 审核通过
+func (ctrl *AdminPostController) Approve(c *gin.Context) {
+	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
+	if err != nil {
+		common.Error(c, http.StatusBadRequest, "无效的帖子 ID")
+		return
+	}
+
+	if err := ctrl.postService.Approve(uint(id)); err != nil {
+		if errors.Is(err, common.ErrPostCannotApprove) || errors.Is(err, common.ErrPostNotFound) {
+			common.Error(c, http.StatusBadRequest, err.Error())
+		} else {
+			common.Error(c, http.StatusInternalServerError, "审核失败")
+		}
+		return
+	}
+
+	common.OkMessage(c, "审核通过")
+}
+
+// Reject 退回
+func (ctrl *AdminPostController) Reject(c *gin.Context) {
+	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
+	if err != nil {
+		common.Error(c, http.StatusBadRequest, "无效的帖子 ID")
+		return
+	}
+
+	var req model.PostRejectRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		common.Error(c, http.StatusBadRequest, "请填写退回理由")
+		return
+	}
+
+	if err := ctrl.postService.Reject(uint(id), req.Reason); err != nil {
+		if errors.Is(err, common.ErrPostCannotReject) || errors.Is(err, common.ErrPostNotFound) {
+			common.Error(c, http.StatusBadRequest, err.Error())
+		} else {
+			common.Error(c, http.StatusInternalServerError, "退回失败")
+		}
+		return
+	}
+
+	common.OkMessage(c, "已退回")
+}
+
+// Lock 锁定
+func (ctrl *AdminPostController) Lock(c *gin.Context) {
+	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
+	if err != nil {
+		common.Error(c, http.StatusBadRequest, "无效的帖子 ID")
+		return
+	}
+
+	var req model.PostLockRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		common.Error(c, http.StatusBadRequest, "请填写锁定理由")
+		return
+	}
+
+	if err := ctrl.postService.Lock(uint(id), req.Reason); err != nil {
+		if errors.Is(err, common.ErrPostNotFound) || errors.Is(err, common.ErrPostCannotLock) {
+			common.Error(c, http.StatusBadRequest, err.Error())
+		} else {
+			common.Error(c, http.StatusInternalServerError, "锁定失败")
+		}
+		return
+	}
+
+	common.OkMessage(c, "已锁定")
+}
+
+// Unlock 解锁
+func (ctrl *AdminPostController) Unlock(c *gin.Context) {
+	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
+	if err != nil {
+		common.Error(c, http.StatusBadRequest, "无效的帖子 ID")
+		return
+	}
+
+	if err := ctrl.postService.Unlock(uint(id)); err != nil {
+		if errors.Is(err, common.ErrPostCannotUnlock) || errors.Is(err, common.ErrPostNotFound) {
+			common.Error(c, http.StatusBadRequest, err.Error())
+		} else {
+			common.Error(c, http.StatusInternalServerError, "解锁失败")
+		}
+		return
+	}
+
+	common.OkMessage(c, "已解锁")
+}
+
+// Restore 恢复软删除
+func (ctrl *AdminPostController) Restore(c *gin.Context) {
+	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
+	if err != nil {
+		common.Error(c, http.StatusBadRequest, "无效的帖子 ID")
+		return
+	}
+
+	if err := ctrl.postService.Restore(uint(id)); err != nil {
+		if errors.Is(err, common.ErrPostNotFound) {
+			common.Error(c, http.StatusBadRequest, err.Error())
+		} else {
+			common.Error(c, http.StatusInternalServerError, "恢复失败")
+		}
+		return
+	}
+
+	common.OkMessage(c, "已恢复")
+}