fix: add node and curl dependencies to backend docker image

backend/Dockerfile

@@ -2,6 +2,13 @@ FROM python:3.10-slim
 
 WORKDIR /app
 
+# Install Node.js (for AIS WebSocket proxy) and curl (for network fallback)
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    curl \
+    && curl -fsSL https://deb.nodesource.com/setup_20.x | bash - \
+    && apt-get install -y --no-install-recommends nodejs \
+    && rm -rf /var/lib/apt/lists/*
+
 # Install dependencies
 COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt

frontend/package-lock.json

@@ -10,6 +10,7 @@
       "dependencies": {
         "@mapbox/point-geometry": "^1.1.0",
         "framer-motion": "^12.34.3",
+        "hls.js": "^1.6.15",
         "lucide-react": "^0.575.0",
         "maplibre-gl": "^4.7.1",
         "next": "16.1.6",
@@ -4321,6 +4322,12 @@
         "hermes-estree": "0.25.1"
       }
     },
+    "node_modules/hls.js": {
+      "version": "1.6.15",
+      "resolved": "https://registry.npmjs.org/hls.js/-/hls.js-1.6.15.tgz",
+      "integrity": "sha512-E3a5VwgXimGHwpRGV+WxRTKeSp2DW5DI5MWv34ulL3t5UNmyJWCQ1KmLEHbYzcfThfXG8amBL+fCYPneGHC4VA==",
+      "license": "Apache-2.0"
+    },
     "node_modules/ieee754": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/ieee754/-/ieee754-1.2.1.tgz",