docs: improve SEO titles and descriptions across docs

[mintlify]

Summary

Audit pass that adds and tunes title and description frontmatter across the docs so every page has a unique, descriptive, search-friendly summary.

Changes

• Added missing description to ~460 pages (mostly reference/protobuf/*, native/*, evm/*, and solutions/* plus several index pages).
• Rewrote ~70 descriptions that were under 130 chars and ~7 that were over 160 chars so all land in the 130–160 char window.
• Shortened 17 titles that exceeded 60 chars (long-form tutorial and setup pages in evm/tools/*, evm/tutorials/*, and native/tutorials/*).
• Ensured every description in scope is unique to its page.
• Skipped 8 external-URL redirect stubs in support/ that only carry title: + url: and aren't real content pages.
• No body content or OpenAPI specs were modified; only frontmatter changed.

[mintlify]

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Project	Status	Preview	Updated (UTC)
hedera-docs	🟢 Ready	View Preview	Jun 11, 2026, 1:44 AM