Initial AI media hub implementation

Dockerfile

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+FROM golang:1.24-bookworm AS go-builder
+WORKDIR /src
+COPY go.mod ./
+RUN go mod download
+COPY backend ./backend
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o /out/ai-media-hub ./backend
+
+FROM python:3.12-slim-bookworm
+ENV APP_ROOT=/app
+WORKDIR /app
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends ffmpeg ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY worker/requirements.txt /app/worker/requirements.txt
+RUN pip install --no-cache-dir -r /app/worker/requirements.txt
+
+COPY --from=go-builder /out/ai-media-hub /app/ai-media-hub
+COPY backend /app/backend
+COPY worker /app/worker
+COPY frontend /app/frontend
+COPY db /app/db
+COPY downloads /app/downloads
+
+EXPOSE 8080
+
+CMD ["/app/ai-media-hub"]