kanban dashboard refactor

internal/kanban/context.go

@@ -0,0 +1,14 @@
+package kanban
+
+import "github.com/labstack/echo/v4"
+
+// ownerIDFromContext returns the board owner ID from admin (user_id) or mobile (customer_id) auth.
+func ownerIDFromContext(c echo.Context) (string, bool) {
+	if id, ok := c.Get("customer_id").(string); ok && id != "" {
+		return id, true
+	}
+	if id, ok := c.Get("user_id").(string); ok && id != "" {
+		return id, true
+	}
+	return "", false
+}