fix: add mimeType to resource declarations in examples (#149)

According to spec, mimeType should be present in both the resource
declaration and the resource content. This adds the missing mimeType
to the registerResource() declaration (third parameter) in all example
servers and the quickstart documentation.

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

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: ochafik <olivier.chafik@gmail.com>

docs/quickstart.md

@@ -130,17 +130,22 @@ server.registerTool(
   },
 );
 
-server.registerResource(resourceUri, resourceUri, {}, async () => {
-  const html = await fs.readFile(
-    path.join(import.meta.dirname, "dist", "mcp-app.html"),
-    "utf-8",
-  );
-  return {
-    contents: [
-      { uri: resourceUri, mimeType: "text/html;profile=mcp-app", text: html },
-    ],
-  };
-});
+server.registerResource(
+  resourceUri,
+  resourceUri,
+  { mimeType: "text/html;profile=mcp-app" },
+  async () => {
+    const html = await fs.readFile(
+      path.join(import.meta.dirname, "dist", "mcp-app.html"),
+      "utf-8",
+    );
+    return {
+      contents: [
+        { uri: resourceUri, mimeType: "text/html;profile=mcp-app", text: html },
+      ],
+    };
+  },
+);
 
 // Express server for MCP endpoint
 const app = express();