refactor(web): reduce query atom subscriptions

[hyoban]

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Summary

Fixes #38520.

• Document that jotai-tanstack-query query atoms do not support TanStack Query tracked properties in the local component-writing skill.
• Add field-specific derived atoms for deployments query results using selectAtom.
• Replace direct UI subscriptions to whole atomWithQuery / atomWithInfiniteQuery results with exact field subscriptions.
• Keep full query result usage only where the workflow needs observer methods, such as refetch orchestration.
• Update source app picker and source step tests for the narrower infinite-scroll query input shape.

Screenshots

Before	After
N/A	N/A

Checklist

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran make lint && make type-check (backend) and cd web && pnpm exec vp staged (frontend) to appease the lint gods

Validation performed:

• pnpm lint <affected deployments files and tests>
• pnpm --filter dify-web test features/deployments/create-guide/ui/__tests__/source-step.spec.tsx features/deployments/create-release/ui/__tests__/source-app-picker.spec.tsx
• git diff --check
• rg "useAtomValue\([^)]*QueryAtom\)|useAtom\([^)]*QueryAtom\)" web/features/deployments -g "*.{ts,tsx}" -g "!**/__tests__/**"

Notes:

• pnpm --filter dify-web type-check currently fails on existing .next/types/validator.ts generated route type errors unrelated to this change.
• cd web && pnpm exec vp staged currently fails because no staged config is defined in vite.config.ts.

From Codex

[codecov]

Codecov Report

❌ Patch coverage is 88.72180% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.33%. Comparing base (56f3d0a) to head (fdb5665).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...features/deployments/detail/deployment-sidebar.tsx	0.00%	6 Missing ⚠️
...ployments/detail/releases/release-actions/state.ts	50.00%	4 Missing ⚠️
...features/deployments/create-guide/state/queries.ts	90.90%	2 Missing ⚠️
...atures/deployments/create-guide/ui/source-step.tsx	83.33%	2 Missing ⚠️
...features/deployments/create-release/state/index.ts	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #38521      +/-   ##
==========================================
- Coverage   85.33%   85.33%   -0.01%     
==========================================
  Files        5009     5009              
  Lines      265583   265654      +71     
  Branches    50499    50496       -3     
==========================================
+ Hits       226634   226691      +57     
- Misses      34499    34513      +14     
  Partials     4450     4450              

Flag	Coverage Δ
dify-ui	94.72% <ø> (ø)
web	84.88% <88.72%> (-0.01%)	⬇️

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