dashboards: migrate from filesystem to postgresql

Replace JSON file storage with DB tables for dashboard layouts,
screens, projects, and terminal defaults. Fresh drizzle migration
with dashboardDefaults table and new columns on screens/projects.

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

src/databases/officer_db/migrations/meta/_journal.json

@@ -5,15 +5,8 @@
     {
       "idx": 0,
       "version": "7",
-      "when": 1772121115932,
-      "tag": "0000_clammy_meteorite",
-      "breakpoints": true
-    },
-    {
-      "idx": 1,
-      "version": "7",
-      "when": 1772265600000,
-      "tag": "0001_rename_workspaces_to_dashboards",
+      "when": 1772795711164,
+      "tag": "0000_futuristic_ink",
       "breakpoints": true
     }
   ]