feat: 添加举报功能支持

- 新增 Report 数据模型、DTO、Repository、Service 层
- 实现用户端举报 API (POST /api/v1/reports)
- 实现管理端举报管理 API (列表、详情、处理、批量处理)
- 添加举报自动隐藏机制（达到阈值自动隐藏内容）
- 集成系统通知（举报处理结果通知）
- 更新路由和 Wire 依赖注入配置

Made-with: Cursor

internal/handler/report_handler.go

@@ -0,0 +1,61 @@
+package handler
+
+import (
+	"carrot_bbs/internal/dto"
+	"carrot_bbs/internal/response"
+	"carrot_bbs/internal/service"
+
+	"github.com/gin-gonic/gin"
+	"go.uber.org/zap"
+)
+
+// ReportHandler 举报处理器
+type ReportHandler struct {
+	reportService service.ReportService
+}
+
+// NewReportHandler 创建举报处理器
+func NewReportHandler(reportService service.ReportService) *ReportHandler {
+	return &ReportHandler{
+		reportService: reportService,
+	}
+}
+
+// Create 创建举报
+func (h *ReportHandler) Create(c *gin.Context) {
+	// 获取用户ID
+	userID := c.GetString("user_id")
+	if userID == "" {
+		response.Unauthorized(c, "未授权")
+		return
+	}
+
+	// 解析请求
+	var req dto.CreateReportRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		response.BadRequest(c, "参数错误: "+err.Error())
+		return
+	}
+
+	// 创建举报
+	report, err := h.reportService.CreateReport(
+		c.Request.Context(),
+		userID,
+		req.TargetType,
+		req.TargetID,
+		req.Reason,
+		req.Description,
+	)
+	if err != nil {
+		zap.L().Error("failed to create report",
+			zap.Error(err),
+			zap.String("user_id", userID),
+			zap.String("target_type", req.TargetType),
+			zap.String("target_id", req.TargetID),
+		)
+		response.Error(c, err.Error())
+		return
+	}
+
+	response.Success(c, dto.ConvertReportToResponse(report))
+}