Add project documentation and initial analysis reports

docs/index.md

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+# PriceFlow Documentation Index
+
+## Project Overview
+
+- **Project:** PriceFlow
+- **Type:** Multi-part (Frontend + Backend)
+- **Primary Languages:** Python, JavaScript (React)
+- **Architecture:** Client-Server / Service-Oriented
+- **Status:** Brownfield Analysis (Quick Scan)
+
+## Quick Reference
+
+### Frontend (User Interface)
+
+- **Path:** `frontend/`
+- **Tech:** React 18, Vite, Tailwind CSS
+- **Documentation:**
+  - [Architecture](./architecture-frontend.md)
+  - [Development Guide](./development-guide.md)
+
+### Backend (API & Worker)
+
+- **Path:** `app/`
+- **Tech:** FastAPI, Python 3.12, SQLAlchemy
+- **Documentation:**
+  - [Architecture](./architecture-app.md)
+  - [API Contracts](./api-contracts-app.md)
+  - [Data Models](./data-models-app.md)
+
+## Generated Documentation
+
+- [Project Overview](./project-overview.md)
+- [Source Tree Analysis](./source-tree-analysis.md)
+- [Integration Architecture](./integration-architecture.md)
+- [Deployment Guide](./deployment-guide.md)
+
+## Existing Documentation
+
+- [Amazon Scraper Details](./AMAZON_SCRAPER.md)
+- [API Catalogues](./API_CATALOGUES.md)
+- [Analysis Report](../RAPPORT_ANALYSE.md)
+- [Startup Guide](../DEMARRAGE.md)
+
+## Getting Started
+
+1. **Setup**: Check the [Deployment Guide](./deployment-guide.md) to get running with Docker.
+2. **Develop**: See the [Development Guide](./development-guide.md) for local setup instructions.
+3. **Explore**: Review the [Source Tree Analysis](./source-tree-analysis.md) to understand the codebase structure.