dsh-patch-edit-plus: Unified Patch Editing Tool for DeepSeek Harness

The `dsh-patch-edit-plus` plugin for DeepSeek Harness (DSH) addresses the low efficiency of line-by-line edits and the difficulty of ensuring atomicity in batch file editing by wrapping a unified `apply_patch` tool. It supports Git unified diff and Codex syntax, with atomic application and zero-byte write capabilities. After installation, parameters such as conflict policy and maximum number of files should be configured in the settings panel. When using it, note that target file directories must already exist and that it relies on a sandboxed execution environment. The plugin is suitable for modifying large files, batch changes across files, and adding or deleting files, effectively balancing development efficiency and security.