Update Dockerfile

Dockerfile

@@ -10,10 +10,7 @@ RUN apt-get update && apt-get install -y \
     libxext6 \
     libxrender1 \
     libgomp1 \
-    swig \
-    mupdf \
-    mupdf-tools \
-    libmupdf-dev \
+    poppler-utils \
     && rm -rf /var/lib/apt/lists/*
 
 # -------- Working dir --------
@@ -21,6 +18,10 @@ WORKDIR /app
 
 # -------- Copy dependencies --------
 COPY requirements.txt .
+
+# Force PyMuPDF to build with bundled MuPDF instead of system version
+ENV PYMUPDF_SETUP_MUPDF_BUILD=""
+
 RUN pip install --no-cache-dir -r requirements.txt
 
 # -------- Copy project code --------