Fixes, New Controls, and Device Registry

[chaichuk]

This PR introduces significant improvements and fixes for NBE V7/V13 controllers. It addresses scaling issues, adds full control capabilities (target temp, hopper, power), and organizes entities into a proper Home Assistant Device.

Key Changes:

• Scaling Fixed: Corrected values for Hopper Content
• Write Protocol Fix: Fixed OSError/IOError when sending commands. The integration now correctly converts values to strings before sending to the controller, which is required for newer firmware versions.
• Power Logic: Implemented correct logic for the Power Switch based on operating_data/state. State 14 is interpreted as OFF, while other states (0, 1, 2, etc.) are interpreted as ON.

New Platforms:

• number platform: Added control for Boiler Target Temperature and Hopper Content. Implemented split multipliers (read x10, write x1) for correct hopper updates.
• switch platform: Added Boiler Power switch (replaces Start/Stop buttons for better UX) and Boiler Pump Force switch.
• button platform: Refactored to contain only the "Reset Alarm" button.

Sensors & Entities:

• Device Registry: Added device_info to all entities. Now all sensors and controls are grouped under a single "NBE Boiler" device in Home Assistant.
• Renaming & Icons: Renamed temperature sensors (e.g., Temperature Boiler, Temperature Return) for better alphabetical sorting. Added Material Design icons (MDI) to all entities.

Cleanup:

• Removed duplicate binary sensors that are now handled by switches.
• Cleaned up __init__.py logging.