build(deploy): update backend image dependencies

backend/Dockerfile

@@ -1,23 +1,32 @@
-FROM python:3.14-slim
+FROM python:3.14
 
 WORKDIR /app
 
 ENV PYTHONDONTWRITEBYTECODE=1
 ENV PYTHONUNBUFFERED=1
-ENV PIP_INDEX_URL=https://package-mirror.liara.ir/repository/pypi/simple
 
-# Adapted Runflare mirror for Debian-based official Python image
-RUN . /etc/os-release && \
-    echo "deb http://mirror-linux.runflare.com/debian $VERSION_CODENAME main" > /etc/apt/sources.list && \
-    echo "deb http://mirror-linux.runflare.com/debian $VERSION_CODENAME-updates main" >> /etc/apt/sources.list && \
-    echo "deb http://mirror-linux.runflare.com/debian-security $VERSION_CODENAME-security main" >> /etc/apt/sources.list
+# ---- APT Iran-safe configuration ----
+RUN rm -f /etc/apt/sources.list.d/debian.sources && \
+    printf '%s\n' \
+    'deb http://mirror.arvancloud.ir/debian trixie main contrib non-free non-free-firmware' \
+    'deb http://mirror.arvancloud.ir/debian trixie-updates main contrib non-free non-free-firmware' \
+    'deb http://mirror.arvancloud.ir/debian-security trixie-security main contrib non-free non-free-firmware' \
+    > /etc/apt/sources.list && \
+    echo 'Acquire::Check-Valid-Until "false";' > /etc/apt/apt.conf.d/99no-check-valid
 
 RUN apt-get update \
-    && apt-get install -y gcc libpq-dev \
+    && apt-get install -y --no-install-recommends \
+        gcc \
+        libpq-dev \
+        rustc \
+        cargo \
+        pkg-config \
     && rm -rf /var/lib/apt/lists/*
 
 COPY requirements/ /app/requirements/
-RUN pip install --no-cache-dir -r requirements/base.txt \
+
+RUN pip install --no-cache-dir --upgrade pip setuptools wheel \
+    && pip install --no-cache-dir -r requirements/base.txt \
     && pip install --no-cache-dir -r requirements/prod.txt
 
 COPY . .