Install full GTK3 + X11 deps for Audiveris JNA compatibility

libgtk-3-0 alone wasn't sufficient — removed --no-install-recommends
and added explicit X11, Pango, ATK, Cairo, GDK-Pixbuf dependencies
that GTK3/JNA requires at runtime.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Dockerfile

@@ -21,7 +21,7 @@ RUN chmod +x gradlew && \
 FROM eclipse-temurin:25-jre
 
 # Install Python, Tesseract, and system deps
-RUN apt-get update && apt-get install -y --no-install-recommends \
+RUN apt-get update && apt-get install -y \
         python3 \
         python3-pip \
         python3-venv \
@@ -30,6 +30,23 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
         libgl1 \
         libglib2.0-0 \
         libgtk-3-0 \
+        libgdk-pixbuf2.0-0 \
+        libpango-1.0-0 \
+        libpangocairo-1.0-0 \
+        libatk1.0-0 \
+        libatk-bridge2.0-0 \
+        libcairo2 \
+        libx11-6 \
+        libxcomposite1 \
+        libxdamage1 \
+        libxext6 \
+        libxfixes3 \
+        libxrandr2 \
+        libxi6 \
+        libxrender1 \
+        libxtst6 \
+        libfreetype6 \
+        libfontconfig1 \
     && rm -rf /var/lib/apt/lists/*
 
 # Copy built Audiveris