refactor(docker): replace uv with pip and move Django commands to runtime

Replace uv package manager with standard pip for dependency management.
Switch base image from debian:bookworm-slim to python:3.12-slim to include
Python runtime by default.

Key changes:
- Remove uv installation and configuration
- Use requirements.txt instead of pyproject.toml/uv.lock
- Install dependencies with pip instead of uv sync
- Move collectstatic and migrate from build-time to runtime in CMD
- Simplify gunicorn command invocation

This simplifies the build process and makes the image more portable by
using standard Python tooling. Running migrations and collectstatic at
container startup ensures they execute against the correct database and
storage backend.

dockerfile

@@ -1,37 +1,32 @@
-FROM debian:bookworm-slim
+FROM python:3.12-slim
 
-# Set environment variables
-ENV PYTHONDONTWRITEBYTECODE 1
-ENV PYTHONUNBUFFERED 1
+# Environment settings
+ENV PYTHONDONTWRITEBYTECODE=1
+ENV PYTHONUNBUFFERED=1
 
 # Set work directory
 WORKDIR /app
 
+# System dependencies
 RUN apt-get update && apt-get install -y \
     build-essential \
     curl wget \
     && rm -rf /var/lib/apt/lists/*
 
-RUN curl -LsSf https://astral.sh/uv/install.sh | sh
-ENV PATH="/root/.local/bin:${PATH}"
+# Copy dependency file
+COPY requirements.txt .
 
-# Copy only the dependency definitions first to leverage Docker's layer caching
-COPY pyproject.toml uv.lock .python-version ./
+# Install Python dependencies
+RUN pip install --no-cache-dir -r requirements.txt
 
-# Install Python dependencies for production
-RUN uv sync --no-group dev --group prod
-
-# Copy the rest of the application code into the container
+# Copy project files
 COPY . .
 
-# Collect the static files
-RUN uv run --no-sync ./manage.py collectstatic --noinput
-
-# Migrate the database
-RUN uv run --no-sync ./manage.py migrate
-
-# Expose the port Gunicorn will run on
+# Expose port
 EXPOSE 8000
 
-# Run with gunicorn
-CMD ["uv", "run", "--no-sync", "gunicorn", "--bind", "0.0.0.0:8000", "--workers", "3", "--access-logfile", "-", "--error-logfile", "-", "--log-level", "info", "config.wsgi:application"]
+# Run migrations + collectstatic + gunicorn at runtime
+CMD \
+  python manage.py migrate && \
+  python manage.py collectstatic --noinput && \
+  gunicorn config.wsgi:application --bind 0.0.0.0:8000 --workers 3