Add package metadata

[yanziwei]

Summary

• add MIT license metadata to the published mcp-framework package manifest
• add repository, homepage, and bugs metadata to the published @mcpframework/docs package manifest
• align metadata with the repository's existing MIT LICENSE file and public issue tracker

Verification

• npm view mcp-framework@latest license --json
• npm view @mcpframework/docs@latest name version license repository homepage bugs --json
• Node manifest assertion for package.json
• Node manifest assertion for packages/docs/package.json
• git diff --check
• npm pack --dry-run --ignore-scripts --json from the root package
• npm pack --dry-run --ignore-scripts --json from packages/docs

Scope

Manifest metadata only. No runtime code, dependencies, exports, generated output, or lockfile changes.