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/00-DOCUMENTATION-MANAGEMENT.md

@@ -146,7 +146,21 @@ docs/
 ├── 03-FRONTEND-ARCHITECTURE.md
 ├── 04-BACKEND-IMPLEMENTATION.md
 ├── 05-AI-FRAMEWORK-IMPLEMENTATION.md
-└── 06-FUNCTIONAL-BUSINESS-LOGIC.md
+├── 06-FUNCTIONAL-BUSINESS-LOGIC.md
+├── API-COMPLETE-REFERENCE.md
+├── WORDPRESS-PLUGIN-INTEGRATION.md
+├── planning/                       # Architecture & implementation planning
+│   ├── IGNY8-HOLISTIC-ARCHITECTURE-PLAN.md
+│   ├── IGNY8-IMPLEMENTATION-PLAN.md
+│   ├── Igny8-phase-2-plan.md
+│   ├── CONTENT-WORKFLOW-DIAGRAM.md
+│   ├── ARCHITECTURE_CONTEXT.md
+│   └── sample-usage-limits-credit-system
+└── refactor/                        # Refactoring plans and documentation
+    ├── README.md
+    ├── routes/
+    ├── folder-structure/
+    └── migrations/
 ```
 
 ### Documentation Update Checklist