Fix makeRequest to return Promise for proper async chaining

[Copilot]

The axios migration removed the return statement from makeRequest, breaking Promise chaining and async/await usage.

Changes

• Add return statement to makeRequest - Restores Promise return value that existed pre-migration
• Fix optional chaining syntax - Replace ?. with && for ES6 compatibility (ecmaVersion: 6 in eslint config)
• Update test assertions - Remove return from callback-style test calls to prevent Mocha's "overspecified resolution" error

Example

// Now works correctly
const result = await mite.getServices();

// And allows proper chaining
mite.getServices()
  .then(services => processServices(services))
  .catch(err => handleError(err));

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