feat(auth): implement user registration and login with JWT authentication

- Added `bcrypt`, `jsonwebtoken`, and `once_cell` dependencies to manage password hashing and JWT handling.
- Created `Claims` struct for JWT claims and implemented token generation in the login route.
- Implemented user registration and authentication logic in the `auth` module.
- Updated error handling to include validation errors.
- Created new routes for user registration and login, and integrated them into the main router.
- Added tests for the authentication flow, including registration and login scenarios.
- Updated user model to include a password hash field.
- Refactored user creation logic to include password validation.
- Adjusted feed and user routes to utilize JWT for authentication.

thoughts-backend/utils/src/testing/api/mod.rs

@@ -49,3 +49,22 @@ pub async fn make_delete_request(app: Router, url: &str, user_id: Option<i32>) -
         .await
         .unwrap()
 }
+
+pub async fn make_jwt_request(
+    app: Router,
+    url: &str,
+    method: &str,
+    body: Option<String>,
+    token: &str,
+) -> Response {
+    let builder = Request::builder()
+        .method(method)
+        .uri(url)
+        .header("Content-Type", "application/json")
+        .header("Authorization", format!("Bearer {}", token));
+
+    let request_body = body.unwrap_or_default();
+    app.oneshot(builder.body(Body::from(request_body)).unwrap())
+        .await
+        .unwrap()
+}