feat: Update Docker and Kubernetes for database infrastructure

- Update backend Dockerfile with PostgreSQL deps and entrypoint
- Add entrypoint.sh with db/redis wait and auto-migration
- Add /ready endpoint for Kubernetes readiness probe
- Enhance /health endpoint with database and Redis status
- Update k8s deployment with PostgreSQL and Redis services
- Add proper secrets management for database credentials
- Update k8s readiness probe to use /ready endpoint

docker/backend/Dockerfile

@@ -9,6 +9,7 @@ WORKDIR /app
 RUN apt-get update && apt-get install -y --no-install-recommends \
     build-essential \
     libmagic1 \
+    libpq-dev \
     && rm -rf /var/lib/apt/lists/*
 
 # Copy requirements first for better caching
@@ -28,6 +29,7 @@ WORKDIR /app
 # Install runtime dependencies only
 RUN apt-get update && apt-get install -y --no-install-recommends \
     libmagic1 \
+    libpq5 \
     curl \
     && rm -rf /var/lib/apt/lists/* \
     && apt-get clean
@@ -46,20 +48,24 @@ RUN mkdir -p /app/uploads /app/outputs /app/logs /app/temp \
 # Copy application code
 COPY --chown=translator:translator . .
 
+# Make entrypoint executable
+RUN chmod +x docker/backend/entrypoint.sh
+
 # Switch to non-root user
 USER translator
 
 # Environment variables
 ENV PYTHONUNBUFFERED=1 \
     PYTHONDONTWRITEBYTECODE=1 \
-    PORT=8000
+    PORT=8000 \
+    WORKERS=4
 
 # Health check
-HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
+HEALTHCHECK --interval=30s --timeout=10s --start-period=10s --retries=3 \
     CMD curl -f http://localhost:${PORT}/health || exit 1
 
 # Expose port
 EXPOSE ${PORT}
 
-# Run with uvicorn
-CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000", "--workers", "4"]
+# Use entrypoint script to handle migrations and startup
+ENTRYPOINT ["docker/backend/entrypoint.sh"]