Restructure case studies for public admin GIS modernization

[yun-dev-cmd]

Summary

• Reorganized the repository into a case-study structure under cases/.
• Moved the consultation-management screenshots and sanitized source into a dedicated case folder.
• Added a boundary-adjustment case covering file-parcel registration, map verification, adjustment-count visualization, and legacy-system constraints.
• Added sanitized Java, JSP, and SQL mapper examples with production identifiers removed.
• Updated the root README with technical evidence, case navigation, redaction rules, changelog, and license.

Review Notes

• Production table names, API paths, work codes, package names, parcel identifiers, and internal map utility names are not included.
• Boundary-adjustment screenshots currently use neutral placeholders until masked real screenshots are ready.
• The repository keeps public documentation focused on technical structure and reviewable implementation decisions.

Checks

• Markdown links were checked.
• README image references were checked.
• Sensitive naming patterns were searched before publishing the branch.