Add Apple Silicon ZMQ detector for Frigate (#206)

## Summary

- New `frigate_detector` ansible role deploys the [apple-silicon-detector](https://github.com/frigate-nvr/apple-silicon-detector) as a LaunchAgent on indri
- Switches Frigate from ONNX CPU detector (~117ms) to ZMQ detector backed by CoreML/Neural Engine (~15ms)
- Removes detect FPS cap (no longer needed with fast inference)
- Updates Frigate docs and adds changelog fragment

## Deployment

### Phase 1: Deploy detector on indri (one-time setup + ansible)
```fish
ssh indri 'git clone https://github.com/frigate-nvr/apple-silicon-detector.git ~/code/3rd/apple-silicon-detector'
ssh indri 'cd ~/code/3rd/apple-silicon-detector && make install'
mise run provision-indri -- --tags frigate_detector --check --diff  # dry run
mise run provision-indri -- --tags frigate_detector                 # apply
ssh indri 'launchctl list mcquack.eblume.frigate-detector'          # verify running
ssh indri 'tail ~/Library/Logs/mcquack.frigate-detector.out.log'    # verify bound
```

### Phase 2: Test connectivity
```fish
kubectl --context=minikube-indri -n frigate exec deploy/frigate -- nc -vz host.minikube.internal 5555
```

### Phase 3: Deploy Frigate config (branch workflow)
```fish
argocd app set frigate --revision feature/frigate-zmq-detector && argocd app sync frigate
```

### Phase 4: Post-deploy checks
- [ ] Pod starts, no config errors
- [ ] `/api/stats` shows detector type zmq, inference_speed ~15ms
- [ ] detect_fps uncapped
- [ ] Recordings and MQTT events flowing
- [ ] After merge: `argocd app set frigate --revision main && argocd app sync frigate`

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Reviewed-on: https://forge.ops.eblu.me/eblume/blumeops/pulls/206

ansible/playbooks/indri.yml

@@ -175,3 +175,5 @@
       tags: jellyfin_metrics
     - role: caddy
       tags: caddy
+    - role: frigate_detector
+      tags: frigate_detector