Add mock mode for WebUI development

- Add mock API classes for camera search and stream discovery
- Add mock mode toggle via ?mock=true URL parameter
- Add visual mock mode indicator badge
- Add dev-server.sh script for local development
- Mock data includes 10 diverse streams (FFMPEG, ONVIF, JPEG, MJPEG, HLS, HTTP_VIDEO)

webui/web/dev-server.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+# Simple development server for Strix WebUI
+# This allows you to test the UI without running the Go backend
+
+PORT=${1:-8080}
+
+echo "Starting development server on port $PORT"
+echo "Open: http://localhost:$PORT?mock=true"
+echo ""
+echo "Press Ctrl+C to stop"
+
+# Use Python's built-in HTTP server
+cd "$(dirname "$0")"
+python3 -m http.server $PORT