fix: add duplicate GSTIN and PAN message checks in party and address (backport #3821)

[mergify]

closes: #3781

Summary by CodeRabbit

• New Features
  • Duplicate-detection for GSTIN and PAN across parties and linked addresses; surfaces orange alerts when potential conflicts are found.
  • Duplicate checks trigger automatically after GSTIN/PAN entry and during quick-entry flows for faster review.
  • Alerts include contextual, highlighted links to matching records (including via-address matches) to aid resolution.

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---

This is an automatic backport of pull request #3821 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 5c96a45 has failed:

On branch mergify/bp/version-15-hotfix/pr-3821
Your branch is ahead of 'origin/version-15-hotfix' by 8 commits.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit 5c96a450.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   india_compliance/public/js/quick_entry.js

no changes added to commit (use "git add" and/or "git commit -a")

Cherry-pick of e2ee569 has failed:

On branch mergify/bp/version-15-hotfix/pr-3821
Your branch is ahead of 'origin/version-15-hotfix' by 9 commits.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit e2ee5690.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   india_compliance/public/js/quick_entry.js

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[codecov]

Codecov Report

❌ Patch coverage is 8.33333% with 44 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.88%. Comparing base (aea8301) to head (140bc8f).
⚠️ Report is 37 commits behind head on version-15-hotfix.

Files with missing lines	Patch %	Lines
india_compliance/gst_india/utils/__init__.py	8.33%	44 Missing ⚠️

Additional details and impacted files

@@                  Coverage Diff                  @@
##           version-15-hotfix    #3911      +/-   ##
=====================================================
- Coverage              60.04%   59.88%   -0.17%     
=====================================================
  Files                    140      140              
  Lines                  14816    14864      +48     
=====================================================
+ Hits                    8897     8901       +4     
- Misses                  5919     5963      +44     

Files with missing lines	Coverage Δ
india_compliance/gst_india/utils/__init__.py	68.55% <8.33%> (-6.23%)	⬇️

... and 2 files with indirect coverage changes

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[india-compliance-bot]

🎉 This PR is included in version 15.25.2 🎉

The release is available on GitHub release

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