test: standardize test imports across test suite

- Add consistent Bun test framework imports to all test files
- Remove duplicate import statements
- Ensure uniform import style for describe, expect, and test functions
- Simplify test file import configurations

__tests__/schemas/hass.test.ts

@@ -1,3 +1,4 @@
+import { describe, expect, test } from "bun:test";
 import { entitySchema, serviceSchema, stateChangedEventSchema, configSchema, automationSchema, deviceControlSchema } from '../../src/schemas/hass.js';
 import Ajv from 'ajv';
 import { describe, expect, test } from "bun:test";