feat(web): add PocketBase backend with migrations and database

web/backend/pb_migrations/1759312218_updated_users.js

@@ -0,0 +1,34 @@
+/// <reference path="../pb_data/types.d.ts" />
+migrate((app) => {
+  const collection = app.findCollectionByNameOrId("_pb_users_auth_")
+
+  // update collection data
+  unmarshal({
+    "authAlert": {
+      "enabled": false
+    },
+    "passwordAuth": {
+      "identityFields": [
+        "username"
+      ]
+    }
+  }, collection)
+
+  return app.save(collection)
+}, (app) => {
+  const collection = app.findCollectionByNameOrId("_pb_users_auth_")
+
+  // update collection data
+  unmarshal({
+    "authAlert": {
+      "enabled": true
+    },
+    "passwordAuth": {
+      "identityFields": [
+        "email"
+      ]
+    }
+  }, collection)
+
+  return app.save(collection)
+})