refactor(web): organize devtools components

[tomerqodo]

Benchmark PR from qodo-benchmark#449

[augmentcode]

🤖 Augment PR Summary

Summary: Refactors the web devtools components to be better organized and loaded only in development.

Changes:

• Moved React Scan into components/devtools/react-scan/ and added ReactScanLoader for dev-only lazy loading.
• Moved TanStack devtools into components/devtools/tanstack/ and added TanStackDevtoolsLoader to encapsulate the dev-only wrapper.
• Updated app/layout.tsx and context/query-client.tsx to use the new loaders and remove duplicated lazy-loading logic.

Technical Notes: Both loaders short-circuit when IS_DEV is false and fall back to rendering nothing if the dynamic import fails.

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