docs: add reference Python/Flask implementation

Previous version of Tanabata used as visual and functional reference
for the new Go + SvelteKit rewrite.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docs/reference/web/static/js/category.js

@@ -0,0 +1,20 @@
+$(document).on("submit", "#object-edit", function (e) {
+	e.preventDefault();
+	$("#loader").css("display", "");
+	$.ajax({
+		url: location.pathname + "/edit",
+		type: "POST",
+		data: $(this).serialize(),
+		dataType: "json",
+		success: function (resp) {
+			$("#loader").css("display", "none");
+			if (!resp.status) {
+				alert(resp.error);
+			}
+		},
+		failure: function (err) {
+			$("#loader").css("display", "none");
+			alert(err);
+		}
+	});
+});