Split SONOFF SNZB-02DR2 into a dedicated quirk with external sensor entities

[viys]

Proposed change

Add dedicated ZHA support for the SONOFF SNZB-02DR2 temperature and humidity sensor.

The quirk replaces the former shared model match, exposes the sensor controls and configuration reminder, supports minimum/maximum-record resets, and maps remote temperature and humidity readings to the two firmware-defined sensor slots. It includes behavior coverage for quirk registration, entity configuration, packet handling, and remote sensor writes.

Additional information

The remote sensor entities retain their existing attribute and translation identifiers; this change only clarifies their user-facing labels as slots 1 and 2.

Device diagnostics

Diagnostic dump: SONOFF SNZB-02DR2

Checklist

• The changes are tested by the included behavior tests
• pre-commit checks pass / the code has been formatted using Black
• Tests have been added to verify the new behavior
• Device diagnostics data has been attached

Full pre-commit run passed: uv run pre-commit run --all-files.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.73%. Comparing base (6a3822c) to head (93465c6).

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #5271      +/-   ##
==========================================
+ Coverage   92.60%   92.73%   +0.13%     
==========================================
  Files         424      425       +1     
  Lines       14667    14940     +273     
==========================================
+ Hits        13582    13855     +273     
  Misses       1085     1085              

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