[Hyperdrive] Add best practices guide

[ivoryibu]

Summary

Adds a Hyperdrive best practices guide that consolidates production guidance and routes readers to the detailed source pages.

• Recommends short-lived database clients and direct database endpoints to preserve Hyperdrive pooling behavior.
• Explains conservative pool sizing, short transactions, and metrics to help prevent connection exhaustion.
• Defines cached and cache-disabled query paths to protect freshness and tenant isolation.
• Covers Placement, private connectivity, driver constraints, retries, and runtime lifecycle patterns.

Screenshots (optional)

Documentation checklist

• The change adheres to the documentation style guide.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.

[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/hyperdrive/	@elithrar, @rita3ko, @irvinebroque, @vy-ton, @ivoryibu, @thomasgauvin, @sejoker, @knickish, @cloudflare/product-owners

[github-actions]

Preview URL: https://5b53acf0.preview.developers.cloudflare.com
Preview Branch URL: https://hyperdrive-best-practices.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/hyperdrive/best-practices/	https://hyperdrive-best-practices.preview.developers.cloudflare.com/hyperdrive/best-practices/

[github-actions]

Hey there, we've marked this pull request as stale because there's no recent activity on it. This label helps us identify PRs that might need updates (or to be closed out by our team if no longer relevant).

[cloudflare-docs-bot]

@ivoryibu This draft pull request has had no activity for 3 days. It will close after 7 days of inactivity. Transition to ready for review if ready. A codeowner can comment /draft-never-stale to keep it open.

[cloudflare-docs-bot]

@ivoryibu Closing this draft pull request after 7 days of inactivity. Re-open at a later date and transition to ready for review when you are ready if you seek review.

[cloudflare-docs-bot]

@ivoryibu This draft pull request has had no activity for 3 days. It will close after 7 days of inactivity. Transition to ready for review if ready. A codeowner can comment /draft-never-stale to keep it open.