Built-in profiles (Flock, Motorola, etc.) include placeholder empty
values like camera:mount: '' for user refinement. When these get
serialized into the routing request body, the alprwatch API rejects
them with HTTP 400.
Fix: strip empty-valued tags from enabled_profiles before sending
the routing request. Also refactor RoutingService to accept an
injectable http.Client for testability, and log error response
bodies for easier debugging of future API issues.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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