Consolidating shared device logic and adding new entities.

[dn5qMDW3]

Proposed change:

This PR consolidates shared device logic into base classes, adds new entities, introduces diagnostics support, and removes unused code

DRY refactor:

• Consolidated shared feeder properties/setters into Feeder base class and shared fountain properties into Fountain base class.
• Extracted _cached_request() helper in api.py with 10s TTL deduplication (9 methods reduced to 2-3 lines each).
• Device.refresh() now namespaces results (realInfo, getAttributeSetting) to eliminate redundant API calls.
• Introduced create_platform_setup() factory to reduce boilerplate across all 8 entity platforms.

New entities:

• Granary Smart Feeder: new sensors and binary sensors.
• Polar Wet Food Feeder: new sensors, temperature reporting switched to Celsius.
• Fountain devices: Water State, Remaining Water, Tank Capacity, Alert Message, Water Low, Device Fault.
• Dockstream 2 devices: Power Source, Radar Sensing Level, Radar Gain, Radar Threshold, Human Sensitivity, Filter LED, Battery 8-Hour Supply, Volume Level.

Bug fixes:

• Fixed available property referencing non-existent self.device in 10 device subclasses.
• Fixed set_child_lock, set_light_enable, set_sound_enable calling .raise_for_status() on parsed JSON.
• Fixed duplicate set_light_on/set_light_off definitions in api.py (second used wrong field names).
• Fixed duplicate child_lock_switch in OneRFIDSmartFeeder (inverted logic removed).
• Fixed duplicate set_feeding_plan in 3 feeder files.
• Fixed power_state not handling powerType=1 (DC adapter) in Dockstream 2 fountains.
• Fixed work record query using feeder event type for fountains (now uses ["DRINK"]).
• Fixed Device.refresh() overwriting device name with empty string from baseInfo.
• Replaced deprecated datetime.utcnow() with datetime.now(timezone.utc) (12 occurrences).
• Masked auth tokens in all debug log messages.

Other improvements:

• Added diagnostics.py for device debugging support.
• Added reconfigure flow, configuration_url, and minimum HA version (2025.4.0).
• Device product icon shown as entity_picture on all entities.
• Updated all 13 language translation files with new entity keys.
• Updated validate.yml CI with scheduled runs and updated action versions.
• Modernized type hints to use modern Python syntax throughout.

Closes # (issue)

Type of change:

• New device.
• Bug fix (non-breaking change which fixes an issue).
• New feature or enhancement (non-breaking change which adds functionality).
• Documentation only.
• Other (please explain).

Major codebase refactor: consolidated shared device logic into base classes, removed dead code/modules, modernized API layer.

Checklist:

• If applicable, I have added corresponding documentation changes.
• If applicable, I have reviewed the feature / enhancement guidlines before submitting my request.
• If applicable, I have tested my code for new features & regressions on the latest version of Home Assistant.

Additional notes:

• Minimum Home Assistant version now set to 2025.4.0.
• All API responses now use _cached_request() with 10-second TTL to reduce duplicate calls.
• Entity entity_picture now shows device product icons on all entities.
• Should work well with: https://github.com/dn5qMDW3/petlibro-cards

[dn5qMDW3]

Superseded by #212 which rebases the same DRY refactoring cleanly on top of current dev (including #201, #204, #209, #210).