refactor: audit-driven quick wins — fix assert.ok misuse, naming conventions, and...

refactor: audit-driven quick wins — fix assert.ok misuse, naming conventions, and hardcoded defaults

- Replace 71 improper assert.ok(comparison) with assert.strictEqual/notStrictEqual
  in 10 test files per TEST_STYLE_GUIDE (assert.ok for boolean/existence only)
- Rename lastUpdated → lastUpdatedDate in auth interfaces and strategies
  to follow Date suffix naming convention
- Extract hardcoded 'ws://localhost' to OCPP20Constants.DEFAULT_CONNECTION_URL
- Replace setTimeout(resolve, 50) with proper httpServer.close() await
  in UIMCPServer integration test