Add CTronics camera adapter

[romainantes]

Adds support for CTronics cameras using HTTP snapshots and ONVIF PTZ/Imaging controls.
It also extends RTSP stream path customization and adds dedicated documentation for camera adapters.

⚠️ Branch "docs/camera-adapter-guide" must be merged before this branch.

Changes:
New Adapter:

• Introduced CTronicsCamera supporting authenticated HTTP snapshots, ONVIF PTZ, CGI relative focus, and ONVIF Imaging.
• Registry & Config: Registered the ctronics adapter in registry.py and updated core/config.py to allow custom rtsp_path overrides.
• Dependencies: Added onvif-zeep dependency to pyproject.toml and requirements.txt.
• Documentation: Updated README.md and camera/adapters/README.md to document adapter responsibilities and configuration details.
• Tests: Added unit and real-hardware integration tests in test_ctronics.py.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.83%. Comparing base (683bd48) to head (33edfcf).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #404   +/-   ##
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  Coverage    78.83%   78.83%           
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  Files            6        6           
  Lines          841      841           
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  Hits           663      663           
  Misses         178      178           

Flag	Coverage Δ
unittests	78.83% <ø> (ø)

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