chore: close websocket connections gracefully when server closes

Makefile

composer.lock

docs/pages/docs/features/ai/server/llama-cpp/index.md

.../how-to-create-llm-websocket-chat-with-llama-cpp/index.md

docs/pages/tutorials/how-to-serve-llm-completions/index.md

psalm.xml

src/Command/Serve.php

src/DatabaseConnection.php

src/Event/HttpServerBeforeStop.php

src/EventListener/CloseWebSocketConnections.php

src/HttpRequestData.php

src/LlamaCppClient.php

src/LlamaCppCompletionIterator.php

src/LlamaCppCompletionToken.php

src/LlamaCppConfiguration.php

src/RedisConnectionPoolConfiguration.php

.../ConfigurationProvider/WebSocketConfigurationProvider.php

src/StaticPageConfiguration.php

src/StaticPageSitemapGenerator.php

src/SwooleChannelIterator.php