fix: unexport Account.Client field, address review findings

docs: add SEO, landing page improvements, and GitHub Pages deploy

docs: rewrite README for clarity and plain language

fix: lazy-load authenticated clients for non-default MCP accounts

fix: resolve golangci-lint v2 findings

fix: upgrade golangci-lint action to v7 for Go 1.25 support

ci: update Go version to 1.25 to match go.mod

release: prepare v1.4.0

fix: harden account alias handling against path traversal and races

fix: update help text, nil slices, and extract shared token path logic

fix: correct README documentation issues

fix: correct setup.md documentation issues

fix: add mutex protection for concurrent map access

docs: add multi-account documentation, bump to v1.1.0

feat: add --account flag to CLI commands