feat(hardware): expose CleanAreaV2 on the 4 mower models

[Beennnn]

Summary

Adds area=CleanAreaV2 to CapabilityCleanAction for the 4 mower hardware models — xmp9ds (GOAT A1600 RTK), 5xu9h3 (GOAT G1), 51rcxt (GOAT A3000 LiDAR Pro), 300lc5 (GOAT O500 Panorama).

Before this change the mower CapabilityCleanAction had only command=CleanV2 and consumers could not launch a specific zone — they had to fall back to the full-map action.

Why

Mowers accept the exact same clean_V2 payload shape as vacuums for spot-area cleaning:

{"act":"s","content":{"type":"spotArea","value":"<zone_id>"}}

Verified on a real GOAT A1600 (FW 1.15.13) by MQTT sniff while the official app launched zone "Trampo":

• The mower's getCleanInfo response reported cleanState.content = {"type":"spotArea","value":"1"} confirming the same envelope as the existing vacuum CleanAreaV2 implementation produces.
• The complementary getAreaSet type:"ar" exposes the named zones with stable numeric IDs (LZMA+base64 encoded in subsets), giving consumers a name → id lookup table at runtime.

So the lib already had the right command (CleanAreaV2) — only the hardware capability declarations needed updating.

What changed

• deebot_client/hardware/xmp9ds.py
• deebot_client/hardware/5xu9h3.py
• deebot_client/hardware/51rcxt.py
• deebot_client/hardware/300lc5.py

Each file gets CleanAreaV2 added to the from deebot_client.commands.json.clean import … and area=CleanAreaV2 attached to the existing CapabilityCleanAction(command=CleanV2, …).

8 lines changed total (4 imports + 4 area parameters).

Tests

• pytest tests/hardware/ → 7 passed
• pytest tests/commands/json/test_clean.py → 27 passed
• The CleanAreaV2 class itself is already covered by the vacuum-side suite; this PR just wires its existing behavior to the mower capability so no new test logic is needed for the command itself.

Notes

• CleanV2 (start/stop/pause/resume) is unchanged — area is an additive capability, not a replacement.
• Other mower-specific PRs in flight (feat(messages): add OnMapTrace for mower firmware (LZMA-wrapped variant) #1567 OnMapTrace, feat: parse getRTK for mower devices #1587 getRTK, feat: add optional position capability for mowers #1588 Position) are independent and don't conflict with this change.

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.99%. Comparing base (8980d8c) to head (7ab01f7).
⚠️ Report is 16 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1596      +/-   ##
==========================================
+ Coverage   94.92%   94.99%   +0.07%     
==========================================
  Files         156      158       +2     
  Lines        6105     6199      +94     
  Branches      350      353       +3     
==========================================
+ Hits         5795     5889      +94     
  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 Beennnn:feat/cleanarea-v2-mowers (7ab01f7) with dev (f87b6c9)}