Refactor unifi_client.py to use Abstract Base Classes

[Copilot]

Restructures unifi_client.py from standalone functions to an ABC-based architecture for better extensibility and type safety.

Changes

• UniFiClientBase abstract class: Defines interface with abstract methods get_infos() and scrape()
• UniFiClient concrete implementation: Encapsulates controller configuration and implements data retrieval logic
• Backward compatibility: Original get_infos() and scrape() functions preserved as wrappers

Usage

# New API - explicit configuration passing
from unifi_respondd.unifi_client import UniFiClient
from unifi_respondd import config

cfg = config.Config.from_dict(config.load_config())
client = UniFiClient(cfg)
aps = client.get_infos()

# Legacy API - still works unchanged
from unifi_respondd import unifi_client
aps = unifi_client.get_infos()

Enables subclassing for testing, mocking, or alternative controller implementations while maintaining existing integration points.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Rewrite unifi_client.py to inherit ABCs new API</issue_title>
<issue_description>This ticket to track the work of re-writing unifi_respondd/unifi_client.py to inherit the new ABC API. </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Rewrite unifi_client.py to inherit ABCs new API #32

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