feat: bake similarity cache into Docker images

- Copy card_files/ to /.defaults/card_files/ during build
- Entrypoint checks for baked-in cache before downloading
- Fallback to GitHub download if not present in image
- Reduces startup time and bandwidth usage

Dockerfile

@@ -32,6 +32,12 @@ COPY config/ ./config/
 COPY config/ /.defaults/config/
 RUN mkdir -p owned_cards
 
+# Copy similarity cache if available (pre-built during CI)
+# Store in /.defaults/card_files so it persists after volume mount  
+RUN mkdir -p /.defaults/card_files
+# Copy entire card_files directory (will include cache if present, empty if not)
+COPY card_files/ /.defaults/card_files/
+
 # Create necessary directories as mount points
 RUN mkdir -p deck_files logs csv_files card_files config /.defaults
 

entrypoint.sh

@@ -6,12 +6,20 @@ seed_defaults() {
     # Ensure base config and data directories exist
     mkdir -p /app/config /app/config/card_lists /app/config/themes /app/card_files
 
-    # Download pre-built similarity cache from GitHub if not present
+    # Copy pre-built similarity cache from image defaults if available, otherwise download
     if [ ! -f /app/card_files/similarity_cache.parquet ]; then
+        # First try to copy from baked-in defaults (included in Docker image during CI builds)
+        if [ -f /.defaults/card_files/similarity_cache.parquet ]; then
+            echo "Copying pre-built similarity cache from image..."
+            cp /.defaults/card_files/similarity_cache.parquet /app/card_files/ 2>/dev/null || true
+            cp /.defaults/card_files/similarity_cache_metadata.json /app/card_files/ 2>/dev/null || true
+        else
+            # Fallback: download from GitHub similarity-cache-data branch
             echo "Downloading similarity cache from GitHub..."
             wget -q https://raw.githubusercontent.com/mwisnowski/mtg_python_deckbuilder/similarity-cache-data/card_files/similarity_cache.parquet -O /app/card_files/similarity_cache.parquet 2>/dev/null || echo "Warning: Could not download similarity cache"
             wget -q https://raw.githubusercontent.com/mwisnowski/mtg_python_deckbuilder/similarity-cache-data/card_files/similarity_cache_metadata.json -O /app/card_files/similarity_cache_metadata.json 2>/dev/null || true
         fi
+    fi
 
     # Copy from baked-in defaults if targets are missing
     if [ -d "/.defaults/config" ]; then