fix: handle integration marketplace install callbacks

[Jingyi-Dify]

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2. Ensure there is an associated issue and you have been assigned to it
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Summary

Fix marketplace install callbacks launched from Integrations so users return to the right Integration category and the selected package is installed from the callback URL instead of being dropped by route redirects.

This PR:

• preserves marketplace install query params when legacy /plugins URLs redirect into Integrations
• routes install callbacks to /integrations/<category>/plugins so the category page stays mounted and can consume package-ids
• extracts the shared marketplace install query consumer used by both the plugin page and integration category page
• wires model provider and data source marketplace entrypoints to the same callback flow as the other Integration categories
• avoids focusing the install dialog close button when returning from marketplace

Verification:

• pnpm -C web test app/components/header/account-setting/model-provider-page/__tests__/install-from-marketplace.spec.tsx app/components/header/account-setting/data-source-page-new/__tests__/install-from-marketplace.spec.tsx app/components/integrations/__tests__/page.spec.tsx app/components/integrations/__tests__/plugin-category-page.spec.tsx app/components/plugins/plugin-page/__tests__/index.spec.tsx app/components/plugins/__tests__/plugin-routes.spec.ts app/components/integrations/__tests__/routes.spec.ts
• pnpm -C web type-check
• pnpm -C packages/dify-ui type-check
• pnpm -C packages/dify-ui exec eslint src/dialog/index.tsx src/dialog/__tests__/index.spec.tsx
• Not run: pnpm -C packages/dify-ui test src/dialog/__tests__/index.spec.tsx because the local Playwright Chromium cache is missing chromium_headless_shell

From Codex

Screenshots

Before	After
Marketplace install callbacks could return to the wrong page, lose package-ids, or require an extra dialog focus cleanup.	Marketplace install callbacks return to the matching Integration category, consume package-ids, and avoid focusing the close button.

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

[codecov]

Codecov Report

❌ Patch coverage is 90.58824% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.36%. Comparing base (089c3f4) to head (2b16c96).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
web/app/components/plugins/plugin-page/index.tsx	60.00%	8 Missing ⚠️
...plugin/hooks/use-install-from-marketplace-query.ts	92.15%	4 Missing ⚠️
web/app/components/plugins/plugin-routes.ts	96.82%	2 Missing ⚠️
...ovider-page/model-selector/marketplace-section.tsx	50.00%	1 Missing ⚠️
.../install-plugin/install-from-marketplace-query.tsx	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #38236      +/-   ##
==========================================
+ Coverage   85.35%   85.36%   +0.01%     
==========================================
  Files        4959     4960       +1     
  Lines      258802   259086     +284     
  Branches    49088    49187      +99     
==========================================
+ Hits       220889   221171     +282     
- Misses      33606    33608       +2     
  Partials     4307     4307              

Flag	Coverage Δ
dify-ui	94.93% <ø> (ø)
web	85.06% <90.58%> (+0.03%)	⬆️

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