I need an automation expert to build a complete end-to-end social media content generation and posting system using n8n and other free, open-source tools wherever possible. The system must automatically: Generate content ideas based on defined topics or inputs. Create captions using AI text generation. Generate images or creatives automatically (e.g., via open-source image generation models or APIs). Combine caption and image into post-ready content. Schedule and auto-post to multiple social media platforms (LinkedIn, Instagram, X, Facebook, etc.). Allow review or approval before posting (optional toggle). Store all generated content in a database or Google Sheets for tracking and re-use. Include monitoring and logging for success/failure of each post. Requirements: Strong experience with n8n automation workflows. Familiarity with AI text and image generation models (e.g., OpenAI, Stable Diffusion, Hugging Face). Integration knowledge for social media APIs (LinkedIn, Meta, X/Twitter). Ability to use self-hosted and open-source solutions to minimize costs. Deliver a fully functional, self-running automation pipeline. Goal: A fully automated, self-sustaining content creation and posting system that runs continuously, generating and publishing new, platform-ready content without manual intervention.