fix(framecache): install wget for healthcheck; make node-agent devices optional

docker-compose.worker.yml

@@ -85,8 +85,7 @@ services:
       # /dev and /opt from the host (handled in the agent, not here) so DKMS /
       # modprobe / ldconfig affect the host kernel.
       - ${REPO_DIR:-/opt/wild-dragon}:${REPO_DIR:-/opt/wild-dragon}:ro
-    devices:
-      - /dev/blackmagic:/dev/blackmagic
+    # (DeckLink devices are mounted dynamically if present)
 
   worker:
     build: ./services/worker

services/framecache/Dockerfile

@@ -14,7 +14,7 @@ RUN cmake -S /src -B /build \
 FROM debian:bookworm-slim
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
-    libmicrohttpd12 \
+    libmicrohttpd12 wget \
   && rm -rf /var/lib/apt/lists/*
 
 COPY --from=builder /build/framecache       /usr/local/bin/framecache