Add optional Datastar plumbing

site/examples/uce-starter/views/datastar-example.uce

@@ -0,0 +1,20 @@
+#load "../lib/app.uce"
+#load "../lib/datastar.uce"
+
+COMPONENT(Request& context)
+{
+	if(context.get["stream"] == "1")
+	{
+		datastar_sse_headers(context);
+		print(datastar_patch_elements("<div id=\"datastar-example-result\">Server-rendered UCE Datastar fragment</div>"));
+		return;
+	}
+
+	<>
+		<h1>Datastar optional example</h1>
+		<p>Datastar is vendored beside the starter client libraries for future server-rendered islands. It is not loaded globally.</p>
+		<script type="module" src="<?= app_asset_url("js/datastar.js", context) ?>"></script>
+		<button class="btn" data-on:click="@get('<?= app_link("datastar-example", context) ?>&amp;stream=1')">Patch a fragment</button>
+		<div id="datastar-example-result">Waiting for a server patch.</div>
+	</>;
+}