Update Dockerfile

Dockerfile

@@ -8,9 +8,12 @@ ENV PATH="/home/user/.local/bin:$PATH"
 # Set working directory
 WORKDIR /app
 
-# Upgrade pip and install requirements
+# Upgrade pip and install requirements cleanly
 COPY --chown=user backend/requirements.txt ./requirements.txt
-RUN pip install --upgrade pip && pip install --no-cache-dir -r requirements.txt
+RUN pip install --upgrade pip && \
+    pip uninstall -y transformers peft || true && \
+    pip install --no-cache-dir -r requirements.txt && \
+    pip install --no-cache-dir "transformers>=4.30.0" "peft>=0.5.0"
 
 # Copy the full project code (backend and data)
 COPY --chown=user . .