feat: 添加用户记账连击（streak）功能，包括服务、处理器、模型和仓库层。

internal/handler/streak_handler.go

@@ -66,8 +66,27 @@ func (h *StreakHandler) RecalculateStreak(c *gin.Context) {
 	api.Success(c, streakInfo)
 }
 
+// GetContributionData handles GET /api/v1/user/streak/contribution
+// Returns daily contribution data for heat map
+func (h *StreakHandler) GetContributionData(c *gin.Context) {
+	userID, exists := c.Get("user_id")
+	if !exists {
+		api.Unauthorized(c, "User not authenticated")
+		return
+	}
+
+	contributionData, err := h.streakService.GetContributionData(userID.(uint))
+	if err != nil {
+		api.InternalError(c, "Failed to get contribution data: "+err.Error())
+		return
+	}
+
+	api.Success(c, contributionData)
+}
+
 // RegisterRoutes registers streak-related routes
 func (h *StreakHandler) RegisterRoutes(rg *gin.RouterGroup) {
 	rg.GET("/user/streak", h.GetStreak)
 	rg.POST("/user/streak/recalculate", h.RecalculateStreak)
+	rg.GET("/user/streak/contribution", h.GetContributionData)
 }