Add paginated users/roles, user status, frontend permissions, profile pictures, identifier file storage

- Users page: paginated, searchable, sortable with inline roles (no N+1)
- Roles page: paginated, searchable, sortable + /roles/all for dropdowns
- User is_active field with migration, PATCH toggle, auth check (disabled=401)
- Frontend permission checks: auth store loads permissions, sidebar/buttons conditional
- Profile pictures via file storage for users and members, avatar component
- Identifier images use file storage API instead of base64
- Fix TypeScript errors across admin UI
- 64 API tests passing (10 new)

packages/backend/src/db/migrations/0014_user_is_active.sql

@@ -0,0 +1 @@
+ALTER TABLE "user" ADD COLUMN "is_active" boolean NOT NULL DEFAULT true;

packages/backend/src/db/migrations/meta/_journal.json

@@ -99,6 +99,13 @@
       "when": 1774730000000,
       "tag": "0013_rbac",
       "breakpoints": true
+    },
+    {
+      "idx": 14,
+      "version": "7",
+      "when": 1774740000000,
+      "tag": "0014_user_is_active",
+      "breakpoints": true
     }
   ]
 }