feat: add account deletion functionality with cascade delete for work… (#33)

* feat: add account deletion functionality with cascade delete for workspace relations

* fix: add cascade delete to workspace user foreign key constraints

* fix: change onDelete action to set null for user references in schema

* feat: tweak design

---------

Co-authored-by: Henry <henry_ball@hotmail.co.uk>
Co-authored-by: Henry <30578846+hjball@users.noreply.github.com>

packages/db/migrations/meta/_journal.json

@@ -29,6 +29,13 @@
       "when": 1749118315675,
       "tag": "20250605101155_AddCascadeDeleteToCardRelations",
       "breakpoints": true
+    },
+    {
+      "idx": 4,
+      "version": "7",
+      "when": 1749405288761,
+      "tag": "20250608175448_AddOnDeleteActionToUserDeletion",
+      "breakpoints": true
     }
   ]
 }