fix: Add /app/static directory, STATIC_PATH env var, and static volume declaration

Dockerfile

@@ -40,8 +40,8 @@ COPY server/ ./server/
 # Copy built frontend from previous stage
 COPY --from=frontend-builder /app/client/dist ./client/dist
 
-# Create necessary directories
-RUN mkdir -p /app/data /app/uploads
+# Create necessary directories (including static for branding assets)
+RUN mkdir -p /app/data /app/uploads /app/static
 
 # Initialize database schema on build
 RUN node server/db/init.js || true
@@ -51,12 +51,13 @@ ENV NODE_ENV=production
 ENV PORT=3000
 ENV DB_PATH=/app/data/breedr.db
 ENV UPLOAD_PATH=/app/uploads
+ENV STATIC_PATH=/app/static
 
 # Expose application port
 EXPOSE 3000
 
 # Set up volumes for persistent data
-VOLUME ["/app/data", "/app/uploads"]
+VOLUME ["/app/data", "/app/uploads", "/app/static"]
 
 # Health check
 HEALTHCHECK --interval=30s --timeout=10s --start-period=40s --retries=3 \