Add admin port support with other major refactorations

docker/.dockerignore

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+OpenTTD-patches/.git
+OpenTTD-patches/build
+config
+Dockerfile
+docker-compose.yml

docker/Dockerfile

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+# Build stage
+FROM debian:bookworm AS builder
+
+RUN apt-get update && apt-get install -y \
+    build-essential \
+    cmake \
+    git \
+    libcurl4-gnutls-dev \
+    liblzma-dev \
+    liblzo2-dev \
+    libpng-dev \
+    libzstd-dev \
+    zlib1g-dev \
+    pkg-config \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /src
+COPY OpenTTD-patches /src/OpenTTD-patches
+
+WORKDIR /src/OpenTTD-patches/build
+RUN cmake .. \
+    -DCMAKE_BUILD_TYPE=Release \
+    -DOPTION_DEDICATED=ON \
+    -DOPTION_INSTALL_HTML_DOCS=OFF \
+    -DOPTION_USE_ASSERTS=OFF \
+    && make -j$(nproc) install
+
+# Runtime stage
+FROM debian:bookworm-slim
+
+RUN apt-get update && apt-get install -y \
+    libcurl3-gnutls \
+    liblzma5 \
+    liblzo2-2 \
+    libpng16-16 \
+    libzstd1 \
+    zlib1g \
+    ca-certificates \
+    openttd-opengfx \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy binaries from builder
+COPY --from=builder /usr/local/games/openttd /usr/local/bin/openttd
+COPY --from=builder /usr/local/share/games/openttd /usr/local/share/games/openttd
+
+# Ensure base graphics are in a path openttd searches
+RUN mkdir -p /usr/local/share/games/openttd/baseset && \
+    cp -r /usr/share/games/openttd/baseset/* /usr/local/share/games/openttd/baseset/
+
+# Create openttd user
+RUN useradd -m -u 1000 openttd
+USER openttd
+WORKDIR /home/openttd
+
+# Create config directory
+RUN mkdir -p /home/openttd/.local/share/openttd/save
+
+EXPOSE 3979/tcp 3979/udp 3977/tcp
+
+CMD ["openttd", "-D"]

docker/README.md

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+# OpenTTD JGRPP Docker Server
+
+This setup builds OpenTTD with the JGR Patch Pack (JGRPP) from source and runs it in a Docker container.
+
+## Getting Started
+
+1.  **Build and start the server:**
+    ```bash
+    docker-compose up -d --build
+    ```
+
+2.  **Accessing the console:**
+    ```bash
+    docker exec -it openttd-jgrpp openttd -D
+    ```
+    (Actually, the server runs in dedicated mode. You can view logs with:)
+    ```bash
+    docker-compose logs -f
+    ```
+
+3.  **Configuration:**
+    The configuration is stored in `config/openttd.cfg`. The default password is set to `asd`.
+
+4.  **Save Games:**
+    Save games are stored in `config/save/`.
+
+## JGRPP Source
+The source code is cloned from the `jgrpp` branch of `https://github.com/JGRennison/OpenTTD-patches`.
+To update the server to a newer JGRPP version:
+1.  Update the `OpenTTD-patches` directory:
+    ```bash
+    cd OpenTTD-patches && git pull && cd ..
+    ```
+2.  Rebuild the image:
+    ```bash
+    docker-compose up -d --build
+    ```

docker/docker-compose.yml

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+services:
+  openttd:
+    build: .
+    container_name: openttd-jgrpp
+    restart: unless-stopped
+    ports:
+      - "3979:3979/tcp"
+      - "3979:3979/udp"
+      - "3977:3977/tcp"
+    volumes:
+      - ./config:/home/openttd/.local/share/openttd
+    environment:
+      - PUID=1000
+      - PGID=1000
+    # Use exec to ensure openttd receives SIGTERM directly for autosave_on_exit
+    command: >
+      bash -c "
+      if [ -f /home/openttd/.local/share/openttd/save/autosave/exit.sav ]; then
+        echo 'Found autosave/exit.sav, loading...'
+        exec openttd -D -g save/autosave/exit.sav
+      else
+        exec openttd -D
+      fi"
+    stop_signal: SIGTERM
+    stop_grace_period: 30s