Add configurable OpenSearch feature and UI improvements

- Add MIT license with Austin Godber copyright
  - Implement optional OpenSearch feature toggle via EMBEDDINGBUDDY_OPENSEARCH_ENABLED
  - Disable OpenSearch by default in production for security
  - Add development environment flag to test OpenSearch disable state
  - Update about modal to open by default with improved content
  - Reorganize text input component: move model selection below text input
  - Conditionally show/hide OpenSearch tab and callbacks based on configuration
  - Update tooltips to reflect OpenSearch availability status

run_dev.py

@@ -11,10 +11,16 @@ def main():
     # Force development settings
     os.environ["EMBEDDINGBUDDY_ENV"] = "development"
     os.environ["EMBEDDINGBUDDY_DEBUG"] = "true"
+
+    # Check for OpenSearch disable flag (optional for testing)
+    # Set EMBEDDINGBUDDY_OPENSEARCH_ENABLED=false to test without OpenSearch
+    opensearch_status = os.getenv("EMBEDDINGBUDDY_OPENSEARCH_ENABLED", "true")
+    opensearch_enabled = opensearch_status.lower() == "true"
     
     print("🚀 Starting EmbeddingBuddy in development mode...")
     print("📁 Auto-reload enabled - changes will trigger restart")
     print("🌐 Server will be available at http://127.0.0.1:8050")
+    print(f"🔍 OpenSearch: {'Enabled' if opensearch_enabled else 'Disabled'}")
     print("⏹️  Press Ctrl+C to stop")
     
     app = create_app()