I need a complete Flutter application that delivers AI-powered consultations through the Gemini API. The core experience is a smooth in-app chat where each user request consumes credits from their balance. Users should be able to purchase credit bundles inside the app, then see those credits automatically deducted every time they consult the AI. Key pieces I expect: • Cross-platform Flutter codebase (Android + iOS) • Gemini API integration for generating responses • Secure user authentication and profile storage • In-app credit wallet, purchase flow, and automatic credit deduction logic • Clean, intuitive chat UI that shows previous conversations and remaining credits • Basic admin view or easily editable config so I can adjust credit pricing, prompt templates, and model settings Hand-off items: full source code, build instructions, and a short README that explains how to plug in my own Gemini API key and payment credentials. If you have suggestions on the best payment gateway or alternative Gemini endpoints, feel free to include them in your proposal.