Implement Self-Service functionality on par with Fineract Self Service API

In 2026, the Fineract Self-Service API was officially removed from the project for security reasons. This project was designed to be the spiritual successor that aims to fix those issues.

However, the project is still missing key self-service capabilities from the old implementation. For example:
- Reports
- Surveys
- Share Accounts
- Pockets
- Create Savings Account Applications

The goal is to reach parity with the old system. We should slowly implement these features so users do not miss old functionality. Allowing the project to more easily substitute for the old one.

Start by reviewing the old Fineract Self-Service API and comparing its Reports, Surveys, Share Accounts, Pockets, and savings account application capabilities with this project. Identify one missing capability to scope first; done should be defined as implementing that capability with parity to the old behavior.

Written by the indexing model from the issue text.