docs: add read-heavy dapp caching guidance

[MuncleUscles]

Summary

• Adds guidance for read-heavy DApps that use readContract / gen_call heavily.
• Recommends batching view functions, serving repeated frontend reads from a backend cache or sidecar, and keeping a verify-on-chain fallback.

Sanitized evidence basis

• Recent builder support threads showed DApps hitting gen_call rate limits during page hydration when every browser session repeatedly queried public RPC.
• Follow-up discussion converged on a controlled-cache/sidecar architecture with direct on-chain verification for trust-sensitive checks.

Test plan

• pnpm build — passes.

Created by weekly docs-and-skills gap loop; draft for human review.

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