Fix TypeScript type conflicts and update build process

- Add overrides for @types/express to resolve version conflicts
- Remove SDK build step from CI as we're now using published version
- Move mcp.png to src/static folder and update serving path
- Add copy-static script to build process

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

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

.github/workflows/main.yml

@@ -20,10 +20,6 @@ jobs:
           cache: npm
 
       - run: npm ci
-      - name: Build MCP SDK from GitHub source
-        run: |
-          cd node_modules/@modelcontextprotocol/sdk
-          npm install
       - run: npm run build
       - run: npm test