Use content instead of structuredContent in examples

Not all MCP clients support structuredContent in MCP tool results, so
examples now return data as JSON in content and parse it client-side.

Pattern used:
- Server: content: [{ type: "text", text: JSON.stringify(data) }]
- Client: JSON.parse(result.content!.filter(...).map(...).join(""))

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

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

examples/budget-allocator-server/src/mcp-app.ts

@@ -606,7 +606,13 @@ const app = new App({ name: "Budget Allocator", version: "1.0.0" });
 
 app.ontoolresult = (result) => {
   log.info("Received tool result:", result);
-  const data = result.structuredContent as unknown as BudgetDataResponse;
+  const text = result
+    .content!.filter(
+      (c): c is { type: "text"; text: string } => c.type === "text",
+    )
+    .map((c) => c.text)
+    .join("");
+  const data = JSON.parse(text) as BudgetDataResponse;
   if (data?.config && data?.analytics) {
     initializeUI(data.config, data.analytics);
   }