Add hotpatch HLD document#2323
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Add the high-level design document for the SONiC hotpatch feature. The hotpatch feature enables applying software patches to a running SONiC system without requiring a full image upgrade or reboot. Document covers: - Hierarchical patch packaging model (Hotfix Package -> Sub-patches -> Packages) - Patch metadata format (patch_info.yml, summary.yml) - Six patch types: docker, debian, script, hook_script, func_hotpatch, dockerfile - libcareplus internals for function-level live patching - Build pipeline tooling (generate.py, check.py, build.sh, package.py) - Installation flow and ordered rollback mechanism - sonic_installer CLI enhancements for patch management - Safety checks, restrictions, and test requirements Signed-off-by: yuezhou.jk <yuezhou.jk@alibaba-inc.com>
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Add the high-level design document for the SONiC hotpatch feature.
The hotpatch feature enables applying software patches to a running SONiC system without requiring a full image upgrade or reboot.
Document covers: