feat(auth): implement user authentication system

backend/node_modules/babel-preset-jest/LICENSE

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+MIT License
+
+Copyright (c) Meta Platforms, Inc. and affiliates.
+Copyright Contributors to the Jest project.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

backend/node_modules/babel-preset-jest/README.md

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+# babel-preset-jest
+
+> Babel preset for all Jest plugins. This preset is automatically included when using [babel-jest](https://github.com/jestjs/jest/tree/main/packages/babel-jest).
+
+## Install
+
+```sh
+$ npm install --save-dev babel-preset-jest
+```
+
+## Usage
+
+### Via `babel.config.js` (Recommended)
+
+```js
+module.exports = {
+  presets: ['jest'],
+};
+```
+
+### Via CLI
+
+```sh
+$ babel script.js --presets jest
+```
+
+### Via Node API
+
+```javascript
+require('@babel/core').transform('code', {
+  presets: ['jest'],
+});
+```

backend/node_modules/babel-preset-jest/index.js

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+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+const jestPreset = {
+  plugins: [require.resolve('babel-plugin-jest-hoist')],
+  presets: [require.resolve('babel-preset-current-node-syntax')],
+};
+
+// @babel/core requires us to export a function
+const jestPresetPlugin = () => jestPreset;
+module.exports = jestPresetPlugin;

backend/node_modules/babel-preset-jest/package.json

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+{
+  "name": "babel-preset-jest",
+  "version": "30.3.0",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/jestjs/jest.git",
+    "directory": "packages/babel-preset-jest"
+  },
+  "license": "MIT",
+  "main": "./index.js",
+  "exports": {
+    ".": "./index.js",
+    "./package.json": "./package.json"
+  },
+  "dependencies": {
+    "babel-plugin-jest-hoist": "30.3.0",
+    "babel-preset-current-node-syntax": "^1.2.0"
+  },
+  "peerDependencies": {
+    "@babel/core": "^7.11.0 || ^8.0.0-beta.1"
+  },
+  "engines": {
+    "node": "^18.14.0 || ^20.0.0 || ^22.0.0 || >=24.0.0"
+  },
+  "publishConfig": {
+    "access": "public"
+  },
+  "gitHead": "efb59c2e81083f8dc941f20d6d20a3af2dc8d068"
+}