Switch backend to wait for SQL Server and use direct INSERTs

Replace stored procedure calls with inline INSERT statements and
SCOPE_IDENTITY()
Add netcat for readiness check in new entrypoint.sh
Introduce dedicated SQL Server and init-db services in docker-compose

backend/Dockerfile

@@ -20,15 +20,19 @@ FROM alpine:3.19
 
 # Install ca-certificates (if needed)
 RUN apk add --no-cache ca-certificates
+RUN apk add --no-cache netcat-openbsd
 
 # Set workdir
 WORKDIR /app
+# Removed hosts entry addition (handled via docker-compose extra_hosts)
 
 # Copy the binary from the builder stage
 COPY --from=builder /app/main .
 
 # Expose the application port (default for the Go server)
+COPY entrypoint.sh .
+RUN chmod +x entrypoint.sh
 EXPOSE 8080
 
 # Command to run the binary
-CMD ["./main"]
+CMD ["./entrypoint.sh"]