FINERACT-2473: Add available balance to group accounts endpoint

[rhopman]

Description

Adds availableBalance field to the group accounts endpoint (/groups/{groupId}/accounts), providing visibility into withdrawable funds by distinguishing between total balance and funds on hold.

Changes

New Fields Added to Savings Account Summary:

• onHoldFunds - Automatic holds from loan guarantees
• savingsAmountOnHold - User-initiated/lien holds
• availableBalance - Calculated as: accountBalance - onHoldFunds - savingsAmountOnHold

Checklist

• Write the commit message as per our guidelines
• Acknowledge that we will not review PRs that are not passing the build ("green") - it is your responsibility to get a proposed PR to pass the build, not primarily the project's maintainers.
• Create/update unit or integration tests for verifying the changes made.
• Follow our coding conventions.
• Add required Swagger annotation and update API documentation at fineract-provider/src/main/resources/static/legacy-docs/apiLive.htm with details of any API changes
• This PR must not be a "code dump". Large changes can be made in a branch, with assistance. Ask for help on the developer mailing list.

Your assigned reviewer(s) will follow our guidelines for code reviews.

[Aman-Mittal]

Address review comments, and please sign your commit with GPG key

[IOhacker]

@rhopman from Adam Monsen's email:

There's a new ci action for PRs to check that new commits are signed.

All committers already have PGP/GPG keys, so just make sure you're also signing commits. You can add this to your ~/.gitconfig (or equivalent) to do it automatically:

[commit]
gpgSign = true

Upload your public key to github to make the verified badges green.

More info: FINERACT-2177, PR #5431.

Hints: 1) try it locally before pushing. 2) have git run it for you: Create .git/hooks/pre-push with:

#!/bin/sh
scripts/verify-signed-commits.sh --strict

Be sure to make that script executable.

[IOhacker]

LGTM

[Aman-Mittal]

LGTM

[IOhacker]

@rhopman it shows conflicts that must be resolve, but I am unable to display which are the errors. Could you please help us?

[IOhacker]

LGTM

[rhopman]

@rhopman it shows conflicts that must be resolve, but I am unable to display which are the errors. Could you please help us?

Done