[PR] fix(log-rotate): remove redundant slash in rotated log file path [apisix]

["binafor (via GitHub)" <gi...@apache.org>]

binafor opened a new pull request, #13960:
URL: https://github.com/apache/apisix/pull/13960

   ### Description
   
   In `log-rotate.lua`, `get_log_path_info` returns `filepath` with a trailing slash (`/`). 
   However, `init_default_logs` concatenates `filepath .. "/%s__" .. filename`, causing redundant double slashes (e.g. `/usr/local/apisix/logs//2026-09-17_00-00-00__access.log`) in the rotated log target path.
   
   This PR removes the redundant slash so the rotated file path stays normalized.
   
   #### Which issue(s) this PR fixes:
   <!-- If there is an issue, write "Fixes #issue_number", otherwise delete this section -->
   
   ### Checklist
   - [x] I have explained the need for this PR and the problem it solves
   - [x] I have explained the changes or the new features added to this PR
   - [ ] I have added tests corresponding to this change
   - [ ] I have updated the documentation to reflect this change
   - [x] I have verified that this change is backward compatible


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