Refactor backend and add registry build workflow

Dockerfile

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+# Use official Python image
+FROM python:3.12-slim
+
+# Set working directory
+WORKDIR /app
+
+# Install system dependencies (needed for some python packages like psycopg2)
+# libpq-dev is often needed for psycopg2
+RUN apt-get update && apt-get install -y \
+    gcc \
+    libpq-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy requirements first for caching
+COPY requirements.txt .
+
+# Install dependencies
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy the rest of the application
+COPY . .
+
+# Expose ports
+# 8080 for HTTP API
+# 8081 for WebSocket
+EXPOSE 8080
+EXPOSE 8081
+
+# Define environment variables
+ENV PYTHONUNBUFFERED=1
+ENV PORT=8080
+ENV WS_PORT=8081
+
+# Command to run the application
+CMD ["python", "app.py"]