docs: Adding Unified error codes to the API - Ref 

Adding Unified error codes to the API - Ref 
<think>
PR Context:
- Title: docs(error_codes): add unified error codes
- Merged: 2024-10-15T14:02:06Z
- Files changed: 1 files
- Commits: 2 commits

Implementation approach:
## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [ ] Bugfix
- [ ] New feature
- [ ] Enhancement
- [ ] Refactoring
- [ ] Dependency updates
- [X] Documentation
- [ ] CI/CD

## Description
<!-- Describe your changes in detail -->

Helps closing - #6318 
### Additional Changes

- [ ] This PR modifies the API contract
- [ ] This PR modifies the database schema
- [ ] This PR modifies application configuration/environment variables

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</think>

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