Add support for DEEBOT T90 PRO OMNI

[assi681]

Adds support for the DEEBOT T90 PRO OMNI, device class twunby.

This follows the new-device guidance from #612. I started from the closest OMNI-style profiles, then adjusted the capabilities based on real-device smoke testing.

Device info

From Home Assistant logs:

• deviceName: DEEBOT T90 PRO OMNI
• class: twunby
• company: eco-ng
• model: SHAKESPEARE_AM_BLK
• UILogicId: shakespeare_ww_h_shakespeareh5
• materialNo: 110-2522-0200

Verification

Tested against a real T90 PRO OMNI.

Confirmed working:

• Device is discovered as supported
• GetBattery
• GetChargeState
• GetWorkState
• GetSweepMode
• GetStationState
• Other read-only getters used in the profile, including fan speed, water info, work mode, continuous cleaning, clean logs/count, child lock, mop auto-wash frequency, OTA, TrueDetect, voice assistant, volume, auto-empty, stats, and lifespan

Not supported by this model during smoke testing:

• getCleanInfo
• getCleanInfo_V2
• getCarpertPressure
• getMultiMapState
• getAdvancedMode

Because of that, this profile uses GetWorkState for state/station refresh and does not include the unsupported T50-derived capabilities.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.95%. Comparing base (8980d8c) to head (f7f9f23).
⚠️ Report is 4 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1561      +/-   ##
==========================================
+ Coverage   94.92%   94.95%   +0.03%     
==========================================
  Files         156      157       +1     
  Lines        6105     6144      +39     
  Branches      350      350              
==========================================
+ Hits         5795     5834      +39     
  Misses        248      248              
  Partials       62       62              

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[codspeed-hq]

Merging this PR will not alter performance

✅ 113 untouched benchmarks

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_{Comparing assi681:assist/add-T90-pro-omni (f7f9f23) with dev (8980d8c)}