fix(server): handle empty declared lists

[he-yufeng]

Summary

• install high-level list handlers when McpServer is constructed with tools, prompts, or resources capabilities already declared
• return empty tools/list, prompts/list, resources/list, and resources/templates/list results when no items are registered yet
• add integration coverage for the declared-but-empty capability cases

Covers the U-7 item in #2202.

Test plan

• pnpm --filter @modelcontextprotocol/test-integration exec vitest run test/server/mcp.test.ts -t "capability is declared without registrations"
• pnpm --filter @modelcontextprotocol/server typecheck
• pnpm --filter @modelcontextprotocol/server lint
• pnpm --filter @modelcontextprotocol/test-integration lint
• pnpm --filter @modelcontextprotocol/server build
• pnpm --filter @modelcontextprotocol/examples-server-quickstart typecheck
• git push pre-push hook: typecheck:all, build:all, lint:all

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Latest commit: 21469d6

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commit: 21469d6

[he-yufeng]

Rebased on current main and force-pushed the cleaned branch.

Validated locally:

• pnpm install
• pnpm --filter @modelcontextprotocol/server typecheck
• pnpm --filter @modelcontextprotocol/server lint
• pnpm --filter @modelcontextprotocol/test-integration test -- test/server/mcp.test.ts (121 passed)
• git diff --check origin/main..HEAD

The pre-push hook also completed the repo-wide build, typecheck, and lint steps successfully.

[he-yufeng]

Closing this during backlog cleanup. This queue has many review-required MCP TypeScript SDK PRs, and this item is lower priority than the remaining transport/protocol fixes with clearer current value. I can reopen or refresh it if maintainers want this exact change.