Summary

• Add package guide pages for @anvia/pinecone and @anvia/milvus
• Include Pinecone and Milvus in package overview, nav metadata, and homepage package counts/list
• Update changelog generation to include pending Pinecone and Milvus changelog pages when package directories are absent, then regenerate changelog docs

Verification

• pnpm --filter docs typecheck
• pnpm --filter docs build