Add lightweight summary endpoint for task statistics

- Add GET /api/residences/summary/ endpoint
- Returns task statistics without full residence data
- Enables efficient refresh of home screen summary counts

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

internal/handlers/residence_handler.go

@@ -56,6 +56,20 @@ func (h *ResidenceHandler) GetMyResidences(c *gin.Context) {
 	c.JSON(http.StatusOK, response)
 }
 
+// GetSummary handles GET /api/residences/summary/
+// Returns just the task statistics summary without full residence data
+func (h *ResidenceHandler) GetSummary(c *gin.Context) {
+	user := c.MustGet(middleware.AuthUserKey).(*models.User)
+
+	summary, err := h.residenceService.GetSummary(user.ID)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, summary)
+}
+
 // GetResidence handles GET /api/residences/:id/
 func (h *ResidenceHandler) GetResidence(c *gin.Context) {
 	user := c.MustGet(middleware.AuthUserKey).(*models.User)