fix: improve rtsp reconnect and fallback

[lan17]

Summary

• Major RTSP robustness work: improved reconnect/fallback behavior, more resilient recording lifecycle, and clearer state handling.
• Large RTSP refactor into focused components (MotionDetector / FramePipeline / Recorder / Clock) and then split into a sources/rtsp/ package for maintainability.
• Added extensive hermetic RTSP runtime tests plus a DB logs querying skill and planning doc.

Key Changes

• Reconnect and fallback logic hardened: exact max attempts, aggressive reconnect when idle, detect-stream fallback with probe/backoff, and deferred fallback while recording.
• Recording robustness: restart backoff, restart while motion is recent, rotation safety, centralized recording state transitions, and more sensitive thresholds while recording.
• Timeout handling: ffmpeg/ffprobe fallback when -rw_timeout/-stimeout unsupported, with log severity reduced to WARN for the timeout-option case.
• RTSP implementation split into src/homesec/sources/rtsp/{core,frame_pipeline,recorder,motion,hardware,clock,utils}.py and import paths updated.
• Tests: new hermetic coverage for reconnects, fallback activation/defer, detect recovery, recording backoff, and ffmpeg/ffprobe timeout fallback.
• Misc: align config validation for recording_sensitivity_factor, update example config, add rtsp_improvements_plan.md, add skills/local/homesec-db-logs/SKILL.md, refresh uv.lock.

Testing

• make check

[codecov]

Codecov Report

❌ Patch coverage is 78.61635% with 272 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.66%. Comparing base (36952bc) to head (7ffa7a4).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/homesec/sources/rtsp/core.py	78.10%	150 Missing ⚠️
src/homesec/sources/rtsp/frame_pipeline.py	76.19%	50 Missing ⚠️
src/homesec/sources/rtsp/recorder.py	71.42%	30 Missing ⚠️
src/homesec/sources/rtsp/hardware.py	65.78%	26 Missing ⚠️
src/homesec/sources/rtsp/motion.py	85.96%	8 Missing ⚠️
src/homesec/sources/rtsp/utils.py	82.60%	4 Missing ⚠️
src/homesec/models/source/ftp.py	93.93%	2 Missing ⚠️
src/homesec/models/source/rtsp.py	97.87%	1 Missing ⚠️
src/homesec/sources/rtsp/clock.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #16      +/-   ##
==========================================
+ Coverage   72.77%   81.66%   +8.88%     
==========================================
  Files          59       69      +10     
  Lines        4849     5263     +414     
==========================================
+ Hits         3529     4298     +769     
+ Misses       1320      965     -355     

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