Organize planning documents and update README structure

- Created a new `docs/planning/` directory to better organize architecture and implementation planning documents.
- Moved existing planning documents into the new directory for improved accessibility.
- Updated `README.md` to reflect the new document structure and added references to the organized planning documents.
- Enhanced overall documentation management for easier navigation and maintenance.

docs/refactor/folder-structure/README.md

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+# FOLDER STRUCTURE REFACTORING PLANS
+
+**Purpose**: Documentation for folder structure refactoring and reorganization.
+
+---
+
+## Current Structure
+
+```
+backend/igny8_core/
+├── modules/          # Feature modules
+├── ai/              # AI framework
+├── api/             # API base classes
+└── middleware/      # Custom middleware
+```
+
+---
+
+## Planned Structure (Domain-Driven)
+
+```
+backend/igny8_core/
+├── core/            # Core models (Account, User, Site, Sector)
+├── domain/          # Domain-specific code
+│   ├── content/     # Content domain
+│   ├── planning/    # Planning domain
+│   ├── linking/     # Linking domain
+│   ├── optimization/# Optimization domain
+│   ├── site_building/# Site building domain
+│   ├── integration/ # Integration domain
+│   └── billing/    # Billing domain
+├── infrastructure/  # Infrastructure code
+│   ├── ai/         # AI framework
+│   ├── storage/    # Storage services
+│   └── queue/      # Queue management
+├── modules/         # Module ViewSets (thin layer)
+├── shared/          # Shared utilities
+└── api/             # API base classes
+```
+
+---
+
+## Migration Strategy
+
+1. Create new domain folders
+2. Move models to domain folders
+3. Create service layer in domain folders
+4. Update imports incrementally
+5. Keep modules folder for ViewSets only
+
+---
+
+## File Organization Rules
+
+- **Models**: `domain/{domain}/models.py`
+- **Services**: `domain/{domain}/services/`
+- **Serializers**: `modules/{module}/serializers.py`
+- **ViewSets**: `modules/{module}/views.py`
+- **URLs**: `modules/{module}/urls.py`
+
+---
+
+**Last Updated**: 2025-01-XX
+