add python3+ffmpeg (Ubuntu 24.04 base, matches SHARED venv) for BOT/render_replay.py replay-canvas rendering, previously entirely missing

Dockerfile

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+FROM ubuntu:24.04 AS builder
+RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates curl gnupg \
+    && curl -fsSL https://deb.nodesource.com/setup_22.x | bash - \
+    && apt-get install -y --no-install-recommends nodejs \
+    && rm -rf /var/lib/apt/lists/*
+WORKDIR /app
+COPY package.json package-lock.json ./
+RUN npm ci --include=dev
+COPY . .
+RUN npm run build
+
+FROM ubuntu:24.04
+# python3+ffmpeg match the SHARED venv's Ubuntu 24.04 build, needed for
+# BOT/render_replay.py (replay-canvas rendering, mounted at deploy time).
+RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates curl gnupg python3 ffmpeg \
+    && curl -fsSL https://deb.nodesource.com/setup_22.x | bash - \
+    && apt-get install -y --no-install-recommends nodejs \
+    && rm -rf /var/lib/apt/lists/*
+WORKDIR /app
+COPY package.json package-lock.json ./
+RUN npm ci --omit=dev
+COPY . .
+COPY --from=builder /app/dist ./dist
+EXPOSE 3010
+CMD ["node", "server.cjs"]

backend/Dockerfile

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+FROM rust:1-slim-bookworm AS builder
+WORKDIR /app
+RUN apt-get update && apt-get install -y --no-install-recommends build-essential pkg-config && rm -rf /var/lib/apt/lists/*
+
+COPY Cargo.toml Cargo.lock ./
+RUN mkdir src && echo "fn main() {}" > src/main.rs \
+    && cargo build --release \
+    && rm -rf src
+
+COPY src ./src
+RUN touch src/main.rs && cargo build --release
+
+FROM debian:bookworm-slim
+RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates && rm -rf /var/lib/apt/lists/*
+WORKDIR /app
+COPY --from=builder /app/target/release/tssbot-backend ./tssbot-backend
+EXPOSE 6000
+CMD ["./tssbot-backend"]