Add Zigbee2MQTT lock provider for MQTT-based locks

[raman325]

Proposed change

Adds support for Zigbee2MQTT locks by publishing/subscribing to MQTT topics. This enables user code management for locks exposed via Zigbee2MQTT:

• Detects Zigbee2MQTT devices by their device identifiers (zigbee2mqtt_*)
• Uses MQTT publish to set/clear PIN codes via zigbee2mqtt/{friendly_name}/set
• Subscribes to device topic for push updates
• Polls via MQTT get requests with async response handling

Maps to the "mqtt" domain in INTEGRATIONS_CLASS_MAP since Zigbee2MQTT devices appear as MQTT entities in Home Assistant.

Also adds "mqtt" to after_dependencies in manifest.

Type of change

• New feature (which adds functionality)

Additional information

• This PR is related to issue: Adding support for additional lock integrations

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 21.49533% with 168 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.28%. Comparing base (059c578) to head (53f4146).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
...ponents/lock_code_manager/providers/zigbee2mqtt.py	21.12%	168 Missing ⚠️

❌ Your patch check has failed because the patch coverage (21.49%) is below the target coverage (90.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #740      +/-   ##
==========================================
- Coverage   96.04%   90.28%   -5.77%     
==========================================
  Files          29       30       +1     
  Lines        2554     2768     +214     
  Branches       83       83              
==========================================
+ Hits         2453     2499      +46     
- Misses        101      269     +168     

Flag	Coverage Δ
python	89.72% <21.49%> (-6.28%)	⬇️

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Files with missing lines	Coverage Δ
...components/lock_code_manager/providers/__init__.py	100.00% <100.00%> (ø)
...ponents/lock_code_manager/providers/zigbee2mqtt.py	21.12% <21.12%> (ø)

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