Fix API Contract: Expand pytest contract validations and negative cases

[Samarth1306w]

Description

Extended the backend API contract test suite to cover malformed or missing required fields, negative scenarios, and async request wrapper test cases.

Changes

• Updated MockBackendApiClient.request to validate missing required fields and property type schemas.
• Implemented test_missing_required_fields_in_payload_returns_error to assert missing required fields payload failures.
• Implemented test_malformed_fields_in_payload_returns_error to assert incorrect type payload failures.
• Extended test_async_request_wrapper_negative_cases to verify async helper behaviors on authentication errors and invalid request parameters without external pytest plugin dependencies.
• Added exact local run execution command comments to tests/backend_api/test_openapi_contract.py docstring.
• Patched build script platform support for Termux/Android.

/claim #1

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