Improve consistency and organization of examples for AI learning

- Add `.gitignore` files to all 19 examples (`node_modules/`, `dist/`)
- Replace custom `log` objects with standard `console` methods
- Add `ontoolcancelled` handler to all `basic-server-*` examples
- Add host styling integration (`applyDocumentTheme`, `applyHostFonts`,
  `applyHostStyleVariables`) to non-React `basic-server-*` examples
- Add section headers for better code organization in feature examples
- Update READMEs with Build System section explaining single-file
  bundling

These changes make examples more consistent and easier to adapt.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

examples/video-resource-server/server.ts

@@ -62,8 +62,11 @@ function createServer(): McpServer {
     version: "1.0.0",
   });
 
-  // Register video resource template
-  // This fetches video from CDN and returns as base64 blob
+  // ===========================================================================
+  // Binary Blob Resource - Binary content is fetched and returned as a
+  // base64-encoded blob.
+  // ===========================================================================
+
   server.registerResource(
     "video",
     new ResourceTemplate("videos://{id}", { list: undefined }),
@@ -109,7 +112,10 @@ function createServer(): McpServer {
     },
   );
 
-  // Register the video player tool
+  // ===========================================================================
+  // Tool Registration
+  // ===========================================================================
+
   registerAppTool(
     server,
     "play_video",
@@ -147,7 +153,10 @@ ${Object.entries(VIDEO_LIBRARY)
     },
   );
 
-  // Register the MCP App resource (the UI)
+  // ===========================================================================
+  // UI Resource Registration
+  // ===========================================================================
+
   registerAppResource(
     server,
     RESOURCE_URI,