Restructure: Introduce Service Classes

[bh2smith]

There are several common patterns that suggest these services could benefit from being organized into classes.

1. Shared State and Configuration:

• BitteUrls is passed around multiple
• Authentication state is managed across multiple functions
• Configuration like ports and URLs are reused

2. Related Methods:

• Plugin operations (register/update/delete) are closely related
• Tunnel operations share setup and cleanup logic
• Authentication methods are tightly coupled

Each Commit will introduce a new class (with successful build at each step).