fix(T2194): add missing values mapping for RETURN_HOME command

[o8uzhan]

Problem

L35 Hybrid (T2194) vacuums don't return to dock when vacuum.return_to_base is called in Home Assistant — instead they start cleaning.

Root cause

RETURN_HOME command in T2194.py had no values mapping:

RobovacCommand.RETURN_HOME: {
    "code": 101,
},

getRoboVacCommandValue() falls back to sending the raw string "return" when no mapping exists, but DPS code 101 on this device is a boolean field — confirmed via debug logs where every status update reports '101': False. Sending a string instead of True causes the vacuum firmware to ignore the command and it starts a cleaning cycle instead.

Fix

Added the missing values mapping:

RobovacCommand.RETURN_HOME: {
    "code": 101,
    "values": {"return": True},
},

Testing

• Added test_t2194_return_home_value regression test — passes.
• Confirmed on real L35 Hybrid hardware: before the fix, pressing 'Return to Dock' sent {"101": "return"} and the vacuum started cleaning. After the fix, it correctly returns to dock.
• Full test suite for this model (7 tests) passes.

[damacus]

I'm going to roll this up into #578, thanks for pointing this out.