feat(auth): implement JWT authentication and user registration

- Added JWT authentication with token generation and validation.
- Introduced user registration functionality with email and password.
- Integrated Argon2 for password hashing.
- Created SQLite user repository for user data persistence.
- Updated application context to include user repository and configuration settings.
- Added environment variable support for JWT secret and registration allowance.
- Enhanced error handling for unauthorized access and validation errors.
- Updated presentation layer to handle login and registration requests.

crates/adapters/sqlite/migrations/0002_users.sql

@@ -0,0 +1,6 @@
+CREATE TABLE IF NOT EXISTS users (
+    id            TEXT PRIMARY KEY NOT NULL,
+    email         TEXT UNIQUE NOT NULL,
+    password_hash TEXT NOT NULL,
+    created_at    TEXT NOT NULL
+);