perf: increase detect fps from 2 to 5 at 1080p

More frames = better chance of capturing plate when car stops at gate.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

config/config.yml

@@ -23,7 +23,7 @@ cameras:
       enabled: true
       width: 1920
       height: 1080
-      fps: 2
+      fps: 5
     objects:
       track:
         - car