feat(api): implement user authentication and registration endpoints

- Add main application logic in `api/src/main.rs` to initialize server, database, and services.
- Create authentication routes in `api/src/routes/auth.rs` for login, register, logout, and user info retrieval.
- Implement configuration route in `api/src/routes/config.rs` to expose application settings.
- Define application state management in `api/src/state.rs` to share user service and configuration.
- Set up Docker Compose configuration in `compose.yml` for backend, worker, and database services.
- Establish domain logic in `domain` crate with user entities, repositories, and services.
- Implement SQLite user repository in `infra/src/user_repository.rs` for user data persistence.
- Create database migration handling in `infra/src/db.rs` and session store in `infra/src/session_store.rs`.
- Add necessary dependencies and features in `Cargo.toml` files for both `domain` and `infra` crates.

domain/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "domain"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+anyhow = "1.0.100"
+async-trait = "0.1.89"
+chrono = { version = "0.4.42", features = ["serde"] }
+serde = { version = "1.0.228", features = ["derive"] }
+serde_json = "1.0.146"
+thiserror = "2.0.17"
+tracing = "0.1"
+uuid = { version = "1.19.0", features = ["v4", "serde"] }
+futures-core = "0.3"
+
+[dev-dependencies]
+tokio = { version = "1", features = ["rt", "macros"] }