[ENH] Implement RoomService unit tests

[TenFinges]

Description

This PR implements comprehensive unit tests for the RoomService class to ensure the reliability of room management features (create, join, leave, delete). It also includes a minor refactor to the RoomService class to enable dependency injection for FlutterSecureStorage, establishing a pattern for testable service architecture.

Fixes #702

Type of change

• Refactor (does not change functionality, e.g. code style improvements, linting)

How Has This Been Tested?

I have implemented a new test suite and validated it against the refactored code.

• Unit Tests: Created test/services/room_service_test.dart covering createRoom, joinRoom, deleteRoom, and lifecycle methods.
• Ran the full test suite (flutter test) to ensure no existing functionality was broken.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

Maintainer Checklist

• closes [ENH] Implement Unit Tests for RoomService #702
• Tag the PR with the appropriate labels

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