refactor(web): split app context state atoms

[hyoban]

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Summary

Issue: N/A

• Split the previous app context state module into focused account, workspace, permission, system feature, and version atom modules.
• Updated downstream imports to consume the focused atom modules directly instead of the removed app-context-state entry point.
• Kept high-use field atoms while making intermediate query/role atoms private and moving dataset RBAC state under system features.
• Updated app context test helpers and related mocks for the new module boundaries.

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 does not apply to typos!)
• I have updated tests/mocks for the changed atom module boundaries, and I tried as much as possible to make a single atomic change.
• I have 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

• git diff --check
• pnpm --dir web type-check
• pnpm --dir web test context/__tests__/console-bootstrap.spec.tsx app/components/plugins/plugin-page/__tests__/use-reference-setting.spec.ts 'app/(commonLayout)/datasets/(datasetDetailLayout)/[datasetId]/__tests__/layout-main.spec.tsx' app/components/datasets/access-config/__tests__/index.spec.tsx app/components/datasets/settings/permission-selector/__tests__/index.spec.tsx app/components/datasets/list/dataset-card/components/__tests__/operations-dropdown.spec.tsx

From Codex

[codecov]

Codecov Report

❌ Patch coverage is 98.64865% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 85.34%. Comparing base (6540d17) to head (978aa25).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
web/__tests__/utils/mock-app-context-state.ts	75.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #38588   +/-   ##
=======================================
  Coverage   85.34%   85.34%           
=======================================
  Files        5017     5021    +4     
  Lines      266979   266979           
  Branches    50824    50821    -3     
=======================================
+ Hits       227844   227847    +3     
+ Misses      34668    34665    -3     
  Partials     4467     4467           

Flag	Coverage Δ
dify-ui	94.61% <ø> (ø)
web	84.85% <98.64%> (+<0.01%)	⬆️

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