UPPCL P2P: Sandbox Readiness

### Description:
UPPCL-P2P Sandbox - NP to guide the identified cohort and help set up ONIX.

### Goals:
- [ ] Guide the identified cohort in setting up ONIX on the UPPCL-P2P sandbox.

### Expected Outcome:
- ONIX is set up successfully in the sandbox environment with support provided to the identified cohort.

### Acceptance Criteria:
- [ ] ONIX setup is complete and functional in the sandbox.
- [ ] Identified cohort has received guidance and support.

### Mockups / Wireframes:
NA

### Product Name:
Beckn

### Domain:
Power Sector

### Tech Skills Needed:
ONIX Setup, Sandbox Configuration

### Complexity:
High

### Category:
Sandbox Readiness

### Sub Category:
ONIX Setup

No files, tests, or entry points are identified. Start by confirming the ONIX setup requirements, sandbox access, and the identified cohort; completion means ONIX is functional in the UPPCL-P2P sandbox and the cohort has received guidance and support.

Written by the indexing model from the issue text.