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/doc/src/auth.rs

@@ -0,0 +1,23 @@
+use api::{
+    models::{ApiErrorResponse, ParamsErrorResponse},
+    routers::auth::*,
+};
+use models::{
+    params::auth::{LoginParams, RegisterParams},
+    schemas::user::UserSchema,
+};
+use utoipa::OpenApi;
+
+#[derive(OpenApi)]
+#[openapi(
+    paths(register, login),
+    components(schemas(
+        RegisterParams,
+        LoginParams,
+        UserSchema,
+        TokenResponse,
+        ApiErrorResponse,
+        ParamsErrorResponse,
+    ))
+)]
+pub(super) struct AuthApi;