feat: media send/receive (intent-based + notification bridge)

- POST /messages/send-media: multipart upload + adb push + intent + Appium
- Webhook mediaType: image detection + adb pull + fanout met download-url
- Download endpoint /download/:token (10 min TTL, cleanup every 5 min)
- Android NotificationListener: detecteert media-notificaties (lege/emoji text)
- Dockerfile: adb toegevoegd voor push/pull
- MEDIA_WAIT_MS env var (default 8000ms) voor pull-timing

wa-appium-api/Dockerfile

@@ -1,9 +1,13 @@
 FROM node:lts-bookworm-slim
 
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    adb \
+    && rm -rf /var/lib/apt/lists/*
+
 WORKDIR /app
 COPY package.json ./
 RUN npm install --omit=dev
 COPY server.js ./
 
-EXPOSE 3002
+EXPOSE 3010
 CMD ["node", "server.js"]