docs: add Base Account compatibility guide

[dieutx]

Summary

• add a new Base Account compatibility guide that explains which docs and dependency stacks go together
• add a direct link to that guide from the Base Account overview page

Problem

Issue #1404 asks for clearer compatibility guidance between major components such as the SDK, wallet-framework integrations, and supporting packages.

Today the docs explain each integration in isolation, but there is no central page that helps builders answer questions like:

• should I use the plain HTML quickstart or the React / Next.js quickstart?
• when do I need Wagmi + Viem + React Query together?
• why does the Privy setup require an @base-org/account override?

Solution

This PR adds a new Compatibility guide page under the Base Account overview section and keeps the guidance grounded in the existing docs:

• maps app architectures to the right starting guide
• summarizes the package families used by each integration pattern
• calls out the Next.js ssr: true requirement for Wagmi-based setups
• calls out the Privy @base-org/account override / resolution requirement

Notes

The guide intentionally stays scoped to combinations already documented in this repo instead of inventing a broader support matrix.

Closes #1404

[cb-heimdall]

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