Update examples to use the SDK package and be standalone

[alexandertu]

Is your feature request related to a problem? Please describe.
The provided examples are not standalone and does not use the typescript-sdk package.

I'm frustrated that the examples have imports like this:

import { McpServer } from '../../server/mcp.js';
import { StreamableHTTPServerTransport } from '../../server/streamableHttp.js';
import { SSEServerTransport } from '../../server/sse.js';
import { CallToolResult, isInitializeRequest } from '../../types.js';
import { InMemoryEventStore } from '../shared/inMemoryEventStore.js';

Source: src/examples/server/sseAndStreamableHttpCompatibleServer.ts

Describe the solution you'd like
Update all examples to be standalone by:

• Using the SDK package directly instead of relying on local imports.
• Ensuring the code can be copied and run as-is.