feat: add fake ONVIF + RTSP camera for local development

[lan17]

Summary

Adds a mock camera environment for local development and testing.

What's included

• mock_onvif.py — Lightweight mock ONVIF server (aiohttp, port 8000) responding to GetServices and GetStreamUri SOAP requests, pointing to the local RTSP stream.
• mediamtx.yml — Config for MediaMTX RTSP server on port 8099.
• Makefile — New make fake-camera target that starts all three services with one command.

Prerequisites

• ffmpeg installed
• mediamtx binary in project root
• A sample .mp4 file at media/sample.mp4
• Python 3 with aiohttp

Usage

make fake-camera

Then configure HomeSec with:

• RTSP URL: rtsp://localhost:8099/live
• ONVIF URL: http://localhost:8000/onvif/device_service

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.73%. Comparing base (2ccca3f) to head (10674a1).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #41      +/-   ##
==========================================
- Coverage   82.76%   82.73%   -0.04%     
==========================================
  Files         107      107              
  Lines        9673     9673              
==========================================
- Hits         8006     8003       -3     
- Misses       1667     1670       +3     

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