Enhance Docker configuration and update dependencies for Realtime Agent Studio

- Updated Dockerfile for the API to include build tools for C++11 required for native extensions.
- Revised requirements.txt to upgrade several dependencies, including FastAPI and SQLAlchemy.
- Expanded docker-compose.yml to add MinIO service for S3-compatible storage and improved health checks for backend and engine services.
- Enhanced README.md in the Docker directory to provide detailed service descriptions and quick start instructions.
- Updated mkdocs.yml to reflect new navigation structure and added deployment overview documentation.
- Introduced new Dockerfiles for the engine and web services, including development configurations for hot reloading.

docs/requirements.txt

@@ -0,0 +1,4 @@
+# Pin MkDocs to 1.x; Material for MkDocs is not yet compatible with MkDocs 2.0
+# https://squidfunk.github.io/mkdocs-material/blog/2026/02/18/mkdocs-2.0/
+mkdocs>=1.6,<2
+mkdocs-material