Dify 1.12.1 release notes

fix(docker): persist IRIS data across container recreation using Durable %SYS by @TomoOkuyama in https://github.com/langgenius/dify/pull/31899
fix(docker): improve IRIS data persistence with proper Durable %SYS by @TomoOkuyama in https://github.com/langgenius/dify/pull/31901
fix: base url in client by @hyoban in https://github.com/langgenius/dify/pull/31902
fix: auto summary env by @zxhlyh in https://github.com/langgenius/dify/pull/31930
fix: fix delete_draft_variables_batch cycle forever by @fatelei in https://github.com/langgenius/dify/pull/31934
chore: bump version in docker-compose and package manager to 1.12.1 by @QuantumGhost in https://github.com/langgenius/dify/pull/31947