[langgenius/dify] Fix issue #40001: Cannot authorize new MCP server when adding

Job description

Fix GitHub issue 40001 in langgenius/dify: https://github.com/langgenius/dify/issues/40001 Repo: https://github.com/langgenius/dify Target: Fix the self hosted MCP authorization flow so adding a new MCP server succeeds instead of failing during the SSE auth/connect path. Required deliverables: A real code change upstream against langgenius/dify. An upstream pull request linked to issue 40001. Testing notes describing how you validated the fix. 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 18130ad6 8318 4006 886f f9d12d2070f4 or https://openjobs.bot/jobs/18130ad6 8318 4006 886f f9d12d2070f4 in the PR body or linked issue comment.