refactor: 文件行数超标拆解（Service + Controller 9/16 完成）

- Service 层：energy_service → energize/operations/admin/query 四文件
- Service 层：post_service → helpers/audit + 核心 CRUD 保留
- Service 层：favorite_service → items + 核心文件夹操作保留
- Service 层：auth_service → password + 核心注册/登录保留
- Service 层：notification_service → notify + 核心列表/已读保留
- Service 层：audit_service → review + 核心列表/详情保留
- Controller 层：studio_controller → page/write/api/post_api/action 五文件
- Controller 层：post_controller → page/api/upload 三文件
- Controller 层：comment_controller → list/write/action/upload 四文件
- 清理未使用导入（notification_service.go 移除 fmt）

internal/controller/comment_upload_controller.go

@@ -0,0 +1,119 @@
+package controller
+
+import (
+	"bytes"
+	"image"
+	"image/jpeg"
+	"image/png"
+	"io"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"time"
+
+	"metazone.cc/metalab/internal/common"
+
+	"github.com/gin-gonic/gin"
+)
+
+// UploadImage 上传评论图片 POST /api/comments/upload-image
+// 需要 LV4+（Exp ≥ 1500），复用帖子图片上传的 WebP 转码逻辑
+func (ctrl *CommentController) UploadImage(c *gin.Context) {
+	uid, _, ok := common.GetGinUser(c)
+	if !ok {
+		common.Error(c, http.StatusUnauthorized, "请先登录")
+		return
+	}
+
+	// LV4+ 检查（Exp ≥ 1500）
+	expVal, exists := c.Get("exp")
+	if !exists {
+		common.Error(c, http.StatusForbidden, "无法获取经验值")
+		return
+	}
+	exp := expVal.(int)
+	if exp < 1500 {
+		common.Error(c, http.StatusForbidden, "需 Lv4 以上才能上传评论图片")
+		return
+	}
+
+	file, header, err := c.Request.FormFile("file")
+	if err != nil {
+		common.Error(c, http.StatusBadRequest, "请选择文件")
+		return
+	}
+	defer file.Close()
+
+	// 检查扩展名
+	ext := strings.ToLower(filepath.Ext(header.Filename))
+	allowedExt := map[string]bool{".jpg": true, ".jpeg": true, ".png": true, ".gif": true, ".webp": true}
+	if !allowedExt[ext] {
+		common.Error(c, http.StatusBadRequest, "仅支持 jpg/jpeg/png/gif/webp 格式")
+		return
+	}
+
+	// 限制 5MB
+	if header.Size > 5<<20 {
+		common.Error(c, http.StatusBadRequest, "图片大小不能超过 5MB")
+		return
+	}
+
+	data, err := io.ReadAll(file)
+	if err != nil {
+		common.Error(c, http.StatusInternalServerError, "读取文件失败")
+		return
+	}
+
+	storageDir := "storage/uploads/posts"
+	if err := os.MkdirAll(storageDir, 0755); err != nil {
+		common.Error(c, http.StatusInternalServerError, "存储初始化失败")
+		return
+	}
+
+	ts := time.Now().UnixMilli()
+	isJPEGPNG := ext == ".jpg" || ext == ".jpeg" || ext == ".png"
+
+	var savePath, url string
+
+	// JPEG/PNG 转 WebP
+	if isJPEGPNG {
+		img, _, err := image.Decode(bytes.NewReader(data))
+		if err != nil {
+			common.Error(c, http.StatusBadRequest, "图片格式无效")
+			return
+		}
+		webpData := encodeWebPBinary(img, len(data))
+		if webpData != nil && len(webpData) < len(data) {
+			filename := strconv.FormatUint(uint64(uid), 10) + "_" + strconv.FormatInt(ts, 10) + ".webp"
+			savePath = filepath.Join(storageDir, filename)
+			os.WriteFile(savePath, webpData, 0644)
+			url = "/uploads/posts/" + filename
+		}
+	}
+
+	// 回退存储
+	if savePath == "" {
+		dataOut := data
+		if isJPEGPNG {
+			decImg, _, decErr := image.Decode(bytes.NewReader(data))
+			if decErr == nil {
+				var buf bytes.Buffer
+				if ext == ".png" {
+					png.Encode(&buf, decImg)
+				} else {
+					jpeg.Encode(&buf, decImg, &jpeg.Options{Quality: 92})
+				}
+				dataOut = buf.Bytes()
+			}
+		}
+		filename := strconv.FormatUint(uint64(uid), 10) + "_" + strconv.FormatInt(ts, 10) + ext
+		savePath = filepath.Join(storageDir, filename)
+		os.WriteFile(savePath, dataOut, 0644)
+		url = "/uploads/posts/" + filename
+	}
+
+	// 返回标准 JSON（前端将 URL 插入评论文本）
+	common.Ok(c, gin.H{"url": url})
+}