Add Qdrant and ChromaDB support to the project

- Added Qdrant service to both docker-compose files for production and development.
- Updated environment variables in .env.example and settings.py to include Qdrant configuration.
- Included necessary dependencies for Qdrant and ChromaDB in requirements.txt.
- Updated .gitignore to exclude ChromaDB data files.

.env.example

@@ -13,3 +13,11 @@ DB_PORT=3306
 
 # Optional: for running manage.py from host (local DB)
 # DB_HOST=127.0.0.1
+
+# Qdrant Vector DB (RAG)
+QDRANT_HOST=qdrant
+QDRANT_PORT=6333
+
+# Avalai Embedding API (OpenAI-compatible)
+AVALAI_API_KEY=your-avalai-api-key
+# AVALAI_BASE_URL=https://api.avalai.ir/v1  # optional, default