fix(connector):  [Peach Payments] fix connector metadata deserialization

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

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

## Description
<!-- Describe your changes in detail -->
fix connector metadata deserialization

Currently we deserialize to camelCase.
but dashboard always sends in snake_case.

### Additional Changes

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

<!--
Provide links to the files with corresponding changes.

Following are the paths where you can find config files:
1. `config`
2. `crates/router/src/configs`
3. `loadtest/config`
-->


## Motivation and Context
<!--
Why is this change required? What problem does it solve?
If it fixes an open issue, please link to the issue here.

If you don't have an issue, we'd recommend starting with one first so the PR
can focus on the implementation (unless it is an obvious bug or documentation fix
that will have little conversation).
-->


## How did you test it?
<!--
Did you write an integration/unit/API test to verify the code changes?
Or did you test this change manually (provide relevant screenshots)?
-->
<img width="836" height="924" alt="Screenshot 2025-10-14 at 2 13 20 PM" src="https://github.com/user-attachments/assets/15635e0c-128d-4bb6-80bb-6bfa38bcc424" />
<img width="938" height="935" alt="Screenshot 2025-10-14 at 2 13 38 PM" src="https://github.com/user-attachments/assets/20d7197f-f5e6-4adf-911b-67e80663ca7f" />


## Checklist
<!-- Put an `x` in the boxes that apply -->

- [ ] I formatted the code `cargo +nightly fmt --all`
- [ ] I addressed lints thrown by `cargo clippy`
- [ ] I reviewed the submitted code
- [ ] I added unit tests for my changes where possible

<think>
PR Context:
- Title: fix(connector):  [Peach Payments] fix connector metadata deserialization
- Merged: 2025-10-14T11:48:24Z
- Files changed: 1 files
- Commits: 2 commits

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

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

## Description
<!-- Describe your changes in detail -->
fix connector metadata deserialization

Currently we deserialize to camelCase.
but dashboard always sends in snake_case.

main pr - #9826

### Additional Changes

- [ ] This PR modifies the API contract
- [ ] This PR modifies the dat
</think>

To implement this, you'll need to modify:


**Detailed Implementation:**


**Commit 1:** fix(connector):  [Peach Payments] fix connector metadata deserialization (#9827)
Co-authored-by: Gna
Files to modify:


**crates/hyperswitch_connectors/src/connectors/peachpayments/transformers.rs**
  Modify existing code
{"issue_number": 9826, "pr_number": 9827, "commits_count": 1, "files_changed": 1, "response_length": 1026, "file_count": 3, "needs_breakdown": false}