feat(commands): Add SetAreaParameter command for mower zone control

[monsivar]

Summary

Add the SetAreaParameter JSON command for controlling zone-specific mower parameters.

This command was identified by capturing the MQTT communication between the Ecovacs app and my GOAT O1200 LiDAR Pro.

Related to #1610.

Command

The mower accepts the following command:

setAreaParameter

The outgoing payload uses a flat structure under body.data:

{
  "areaID": "2",
  "mowHeightLevel": 10,
  "cutMode": 7,
  "obstacleHeight": 1,
  "angle": 136
}

The areaParameters list is used by the device's subsequent onAreaParameter status report, but it is not part of the outgoing setAreaParameter command.

Changes

• Add SetAreaParameter under deebot_client.commands.json.
• Register the command in the JSON command registry.
• Export the command from deebot_client.commands.json.
• Add tests for the default values.
• Add tests for custom values.

Parameters

• area_id: ID of the mower area.
• angle: mowing direction in degrees.
• mow_height_level: mower height level.
• cut_mode: cutting mode, defaulting to 7.
• obstacle_height: obstacle-height setting, defaulting to 1.

Verification

The payload structure was captured from the Ecovacs app and successfully used with my GOAT O1200 LiDAR Pro.

This PR only adds the command implementation and tests. It does not yet add a higher-level capability or expose the command through Home Assistant.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.08%. Comparing base (2a7b432) to head (8804e57).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #1627   +/-   ##
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  Coverage   95.08%   95.08%           
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  Files         161      162    +1     
  Lines        6301     6308    +7     
  Branches      354      354           
=======================================
+ Hits         5991     5998    +7     
  Misses        248      248           
  Partials       62       62           

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[codspeed-hq]

Merging this PR will not alter performance

✅ 226 untouched benchmarks

---

_{Comparing monsivar:feature-set-area-command (8804e57) with dev (2a7b432)}

[monsivar]

I have addressed the requested changes:

removed the unrelated lifespan and hardware changes;
moved SetAreaParameter to the commands module;
registered it in the JSON command registry;
corrected the outgoing payload to use the flat body.data structure observed in the MQTT capture;
added tests for default and custom values.

All checks are now passing. The PR should be ready for another review. Thank you for the guidance.