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/scenario-modeler-server/src/mcp-app.tsx

@@ -24,11 +24,15 @@ interface CallToolResultData {
   defaultInputs?: ScenarioInputs;
 }
 
-/** Extract templates and defaultInputs from tool result structuredContent */
+/** Extract templates and defaultInputs from tool result content */
 function extractResultData(result: CallToolResult): CallToolResultData {
-  if (!result.structuredContent) return {};
-  const { templates, defaultInputs } =
-    result.structuredContent as CallToolResultData;
+  const text = result
+    .content!.filter(
+      (c): c is { type: "text"; text: string } => c.type === "text",
+    )
+    .map((c) => c.text)
+    .join("");
+  const { templates, defaultInputs } = JSON.parse(text) as CallToolResultData;
   return { templates, defaultInputs };
 }