fix(capture): move fc_client back to framecache, rely on root build context

services/capture/Dockerfile

@@ -23,7 +23,8 @@ FROM debian:bookworm AS fc-pipe-builder
 RUN apt-get update && apt-get install -y --no-install-recommends \
     build-essential cmake libmicrohttpd-dev \
   && rm -rf /var/lib/apt/lists/*
-COPY ../framecache /fc-src
+COPY fc_client /fc-src/client
+COPY deltacast-bridge /fc-src/src/slot.h # (copy from existing location)
 RUN cmake -S /fc-src -B /fc-src/build \
       -DCMAKE_BUILD_TYPE=Release \
   && cmake --build /fc-src/build --target fc_pipe -j$(nproc)