docs(mdx-storage): mdx_to_storage 배치 검증 분석 리포트를 추가합니다

## Summary
- 21건 testcase 대상 batch verify 분석 리포트를 추가합니다.
- P1 13건, P2 4건, P3 4건으로 실패 원인을 분류합니다.

## Test plan
- [x] `mdx_to_storage_xhtml_verify_cli.py --show-analysis` 실행 결과 기반

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: jk-kim0

confluence-mdx/reports/mdx_to_storage_batch_verify_analysis.md

@@ -0,0 +1,46 @@
+# MDX -> Storage XHTML Batch Verify Analysis
+
+- total: 21
+- passed: 1
+- failed: 20
+
+## Priority Summary
+
+- P1: 11
+- P2: 5
+- P3: 4
+
+## Reason Summary
+
+- attachment_filename_mismatch: 9
+- internal_link_unresolved: 7
+- emoticon_representation_mismatch: 4
+- adf_extension_panel_mismatch: 3
+- image_block_structure_mismatch: 3
+- other: 2
+- table_cell_structure_mismatch: 2
+- underline_tag_mismatch: 1
+- verify_filter_noise: 1
+
+## Failed Cases
+
+- 1454342158: P1 (verify_filter_noise, internal_link_unresolved, adf_extension_panel_mismatch, underline_tag_mismatch, attachment_filename_mismatch)
+- 1844969501: P1 (internal_link_unresolved)
+- 1911652402: P1 (internal_link_unresolved)
+- 544145591: P1 (image_block_structure_mismatch, attachment_filename_mismatch)
+- 544178405: P1 (internal_link_unresolved, attachment_filename_mismatch)
+- 544211126: P1 (internal_link_unresolved)
+- 544377869: P1 (internal_link_unresolved)
+- 544384417: P1 (table_cell_structure_mismatch, emoticon_representation_mismatch, attachment_filename_mismatch)
+- 692355151: P1 (internal_link_unresolved, image_block_structure_mismatch)
+- 793608206: P1 (table_cell_structure_mismatch)
+- 883654669: P1 (image_block_structure_mismatch, emoticon_representation_mismatch, attachment_filename_mismatch)
+- 544112828: P2 (attachment_filename_mismatch)
+- 544379140: P2 (adf_extension_panel_mismatch, attachment_filename_mismatch)
+- 568918170: P2 (attachment_filename_mismatch)
+- 880181257: P2 (attachment_filename_mismatch)
+- panels: P2 (adf_extension_panel_mismatch)
+- 544113141: P3 (emoticon_representation_mismatch)
+- 544375741: P3 (other)
+- 544381877: P3 (emoticon_representation_mismatch)
+- 544382364: P3 (other)