chore: snapshot current intranet work

backup_snapshots/20260410_0900/BACKUP_NOTE.txt

@@ -0,0 +1,13 @@
+Backup created: 2026-04-10 09:00 KST
+Files:
+- main.py
+- data.db
+- templates/base.html
+- templates/dashboard.html
+- templates/index.html
+- templates/projects.html
+- templates/annual_summary.html
+- README.md (if present)
+- WORK_SUMMARY_20260408.md
+- WORK_SUMMARY_20260409.md
+- DB_HEALTH_CHECK_20260409.md