fix: post restructure charges capitalization (backport #1239)

[mergify]

Summary by CodeRabbit

• New Features

  • Mark charges as post-restructure on sales invoices.
  • Auto-create principal-capitalization repayments when post-restructure charges are invoiced.

• Improvements

  • Allow payable charges for principal capitalization during restructures; refine repayment allocation, GL entry flow, and payment account resolution.

• Tests

  • Expect an additional repayment record and verify post-restructure invoice creation and paid status.

• Chores

  • Add migration patch to add the new invoice field.

---

This is an automatic backport of pull request #1239 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of d005f2b has failed:

On branch mergify/bp/version-2-beta/pr-1239
Your branch is up to date with 'origin/version-2-beta'.

You are currently cherry-picking commit d005f2b3.
  (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)

Changes to be committed:
	modified:   lending/install.py
	modified:   lending/loan_management/doctype/loan_disbursement/loan_disbursement.py
	modified:   lending/loan_management/doctype/loan_restructure/test_loan_restructure.py
	modified:   lending/patches.txt
	new file:   lending/patches/v16_0/add_is_post_restructure_charge_field.py

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   lending/loan_management/doctype/loan_repayment/loan_repayment.py
	both modified:   lending/loan_management/doctype/loan_restructure/loan_restructure.py

Cherry-pick of 5d74936 has failed:

On branch mergify/bp/version-2-beta/pr-1239
Your branch is ahead of 'origin/version-2-beta' by 1 commit.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit 5d749367.
  (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:   lending/loan_management/doctype/loan_restructure/loan_restructure.py

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

Cherry-pick of 02cace5 has failed:

On branch mergify/bp/version-2-beta/pr-1239
Your branch is ahead of 'origin/version-2-beta' by 2 commits.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit 02cace56.
  (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)

Changes to be committed:
	modified:   lending/patches/v16_0/add_is_post_restructure_charge_field.py

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   lending/loan_management/doctype/loan_repayment/loan_repayment.py
	both modified:   lending/loan_management/doctype/loan_restructure/test_loan_restructure.py

Cherry-pick of 6713d25 has failed:

On branch mergify/bp/version-2-beta/pr-1239
Your branch is ahead of 'origin/version-2-beta' by 3 commits.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit 6713d25c.
  (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:   lending/loan_management/doctype/loan_repayment/loan_repayment.py

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

Cherry-pick of 53baa99 has failed:

On branch mergify/bp/version-2-beta/pr-1239
Your branch is ahead of 'origin/version-2-beta' by 4 commits.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit 53baa994.
  (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:   lending/loan_management/doctype/loan_repayment/loan_repayment.py

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

Cherry-pick of cd58469 has failed:

On branch mergify/bp/version-2-beta/pr-1239
Your branch is ahead of 'origin/version-2-beta' by 5 commits.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit cd584693.
  (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)

Changes to be committed:
	modified:   lending/install.py
	modified:   lending/loan_management/doctype/loan_disbursement/loan_disbursement.py
	modified:   lending/loan_management/doctype/loan_restructure/loan_restructure.py
	modified:   lending/loan_management/doctype/loan_restructure/test_loan_restructure.py
	modified:   lending/overrides/sales_invoice.py
	deleted:    lending/patches/v16_0/add_is_post_restructure_charge_field.py

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   lending/patches.txt

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