Initial scaffold: React+TS+Vite frontend, FastAPI backend, config system

config.example.yaml

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+# Camera Viewer Configuration
+# Copy this file to config.yaml and customize for your setup
+
+title: "Camera Viewer"
+
+# go2rtc server for WebRTC/MSE streaming
+go2rtc:
+  url: "http://your-go2rtc-host:1985"
+
+# Frigate NVR (optional, for snapshots)
+frigate:
+  url: "http://your-frigate-host:5000"
+
+# MQTT broker (optional, for person detection alerts)
+mqtt:
+  host: "your-mqtt-host"
+  port: 1883
+  topic_prefix: "frigate"
+  username: ""
+  password: ""
+
+# Camera list — names must match go2rtc stream names
+cameras:
+  - name: camera1
+    display_name: "Camera 1"
+    enabled: true
+    order: 0
+  - name: camera2
+    display_name: "Camera 2"
+    enabled: true
+    order: 1
+
+# Alert settings (requires MQTT)
+alerts:
+  enabled: false
+  auto_dismiss_seconds: 30
+  suppression_seconds: 60
+  cameras: []            # empty = all cameras
+  detection_types:
+    - "person"
+
+# Grid layout
+grid:
+  columns: null          # null = auto based on camera count
+  aspect_ratio: "16:9"
+  gap: 4                 # gap in pixels