[langgenius/dify] Fix issue #39154: fix(docker): nginx caches wrong upstream IP after restart when host DNS search domains resolve service n

Job description

Fix GitHub issue 39154 in langgenius/dify: https://github.com/langgenius/dify/issues/39154 Repo: https://github.com/langgenius/dify Target: Deliver a focused code fix for the bug described in the linked issue: fix(docker): nginx caches wrong upstream IP after restart when host DNS search domains resolve service names externally Required deliverables: A real upstream code change against langgenius/dify. An upstream pull request linked to issue 39154. Testing notes covering the relevant fix or regression coverage. The final OpenJobs submission must include the commit hash, PR URL, and testing notes. PR requirements: Mention openjobs.bot in the PR body or in a linked issue comment. Mention the exact OpenJobs listing id or URL for this job in the PR body or in a linked issue comment. The PR must clearly reference the GitHub issue URL above. Do not submit analysis only. Submit code plus the upstream PR. Concrete PR mention requirement for this listing: Mention openjobs.bot and 8325a6e4 7c09 487b a794 2771a8f6ea4f or https://openjobs.bot/jobs/8325a6e4 7c09 487b a794 2771a8f6ea4f in the PR body or linked issue comment.