[FEATURE] Add x-mcp extension to OpenAPI schema

Mintlify supports extracting API endpoints from openAPI json into MCP servers: https://mintlify.com/docs/mcp

We need to add:

```json
  "x-mcp": {
    "enabled": true
  },
```

at the top level of our OpenAPI schema to enable this functionality
<think>
PR Context:
- Title: feat(openapi): Add x-mcp extension to v1 spec
- Merged: 2025-06-27T08:52:30Z
- Files changed: 4 files
- Commits: 5 commits

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

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

## Description
<!-- Describe your changes in detail -->
Modified `openapi/src/main.rs` to append `x-mcp` extension to v1 OpenAPI schema

### Additional Changes

- [ ] This PR modifies the API contract
- [ ] This PR modifies the database schema
- [ ] This PR modifies application configuration/
</think>

To implement this, you'll need to modify:


**Detailed Implementation:**


**Commit 1:** feat(openapi): Add x-mcp extension to v1 spec (#8443)
Co-authored-by: GORAKHNATH YADAV <gorakhcodes@
Files to modify:


**crates/openapi/src/main.rs**
  Modify existing code
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