feat(setup): add generic setup test-connection endpoint

[lan17]

Summary

• add POST /api/v1/setup/test-connection for non-persistent setup connectivity checks
• add setup API models for test-connection payload/response in homesec.models.setup
• implement setup service dispatch for camera | storage | notifier | analyzer probes with backend-specific validation and timeout handling
• support camera probes for rtsp, ftp, local_folder, and onvif
• include structured 400 mapping for unknown backends with available_backends hints
• regenerate UI API artifacts (ui/src/api/generated/openapi.json, ui/src/api/generated/schema.ts)

Behavior Notes

• probes are intentionally non-persistent: no config writes, no runtime reloads
• plugin-based probes (storage/notifier/analyzer) validate config, instantiate plugin, run ping(), and always attempt shutdown()
• route uses canonical API envelope on errors

Validation

• DB_DSN=postgresql+psycopg://homesec:homesec@localhost:5433/homesec make check

Related Notion

• Backend: Generic test-connection endpoint
• Design: Onboarding wizard for new users
• Backend: Bootstrap mode for setup wizard

[codecov]

Codecov Report

❌ Patch coverage is 88.51852% with 31 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.88%. Comparing base (9b7160f) to head (b51288d).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/homesec/services/setup.py	87.80%	30 Missing ⚠️
src/homesec/app.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #32      +/-   ##
==========================================
+ Coverage   82.74%   82.88%   +0.13%     
==========================================
  Files         107      107              
  Lines        9382     9650     +268     
==========================================
+ Hits         7763     7998     +235     
- Misses       1619     1652      +33     

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