Add support for TZE204 TS0601 Tuya/MoesBHT electric floor heating thermostats

[trougnouf]

Proposed change

Add V2 QuirkBuilder support for Moes BHT-series thermostats, including model IDs _TZE204_aoclfnxz, _TZE204_xalsoe3m, _TZE204_u9bfwha0, and _TZE200_ztvwu4nk.

This implementation includes TuyaThermostatExtendedLimits to correctly handle setpoint limits up to 45 °C, which prevents "out of range" errors in Home Assistant when the device is adjusted manually.

Additional information

Follows logic originally proposed by @prairiesnpr in draft PR #3870 (which I had been using but it hasn't moved in a year)

These newer _TZE204 devices require the V2 architecture to correctly expose all climate entities and attributes.

Tested with _TZE204_aoclfnxz on Home Assistant Container 2026.3.4

Device diagnostics

zha-01K7PPW960F3FNGVX7VKE3XCQ2-_TZE204_aoclfnxz TS0601-2c3f947eec7c2daff8e49ac9cfe65da4.json

Checklist

• The changes are tested and work correctly
• pre-commit checks pass / the code has been formatted using Black
• Tests have been added to verify that the new code works
• Device diagnostics data has been attached

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.05%. Comparing base (380135d) to head (696ac88).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #4867   +/-   ##
=======================================
  Coverage   93.04%   93.05%           
=======================================
  Files         397      397           
  Lines       13248    13252    +4     
=======================================
+ Hits        12327    12331    +4     
  Misses        921      921           

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