remove unused chromium to reduce image size and fit disk

Dockerfile.prod

@@ -12,10 +12,7 @@ WORKDIR /usr/src/app
 ENV PYTHONDONTWRITEBYTECODE=1 \
     PYTHONUNBUFFERED=1 \
     PIP_NO_CACHE_DIR=1 \
-    PIP_DISABLE_PIP_VERSION_CHECK=1 \
-    CHROME_BIN=/usr/bin/chromium \
-    CHROME_DRIVER=/usr/bin/chromedriver \
-    DISPLAY=:99
+    PIP_DISABLE_PIP_VERSION_CHECK=1
 
 # 1. System Dependencies (Cached permanently unless system packages change)
 RUN apt-get update && apt-get install -y --no-install-recommends \
@@ -29,8 +26,6 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     libfreetype6-dev \
     gettext \
     ffmpeg \
-    chromium \
-    chromium-driver \
     && rm -rf /var/lib/apt/lists/*
 
 # 2. Python Dependencies (Cached unless requirements.txt changes)