fix(db): remove duplicate DDL from 0012 migration

Backend/drizzle/0012_natural_daredevil.sql

@@ -0,0 +1,2 @@
+-- This migration was accidentally generated as a full schema snapshot, duplicating
+-- DDL already applied in 0000-0011. Keep this tag as a no-op to preserve migration order.

Backend/drizzle/meta/_journal.json

@@ -85,6 +85,13 @@
       "when": 1770418956419,
       "tag": "0011_security_audit_logs",
       "breakpoints": true
+    },
+    {
+      "idx": 12,
+      "version": "7",
+      "when": 1770740394562,
+      "tag": "0012_natural_daredevil",
+      "breakpoints": true
     }
   ]
-}
+}