feat: add support for user registration toggle and Traefik integration in Docker setup

k-tv-backend/api/src/routes/auth.rs

@@ -73,6 +73,10 @@ async fn register(
     State(state): State<AppState>,
     Json(payload): Json<RegisterRequest>,
 ) -> Result<impl IntoResponse, ApiError> {
+    if !state.config.allow_registration {
+        return Err(ApiError::Forbidden("Registration is disabled".to_string()));
+    }
+
     let password_hash = infra::auth::hash_password(payload.password.as_ref());
 
     let user = state

k-tv-backend/api/src/routes/config.rs

@@ -1,4 +1,6 @@
-use axum::{Json, Router, routing::get};
+use axum::{Json, Router, extract::State, routing::get};
+use std::sync::Arc;
+use crate::config::Config;
 use crate::dto::ConfigResponse;
 use crate::state::AppState;
 
@@ -6,8 +8,8 @@ pub fn router() -> Router<AppState> {
     Router::new().route("/", get(get_config))
 }
 
-async fn get_config() -> Json<ConfigResponse> {
+async fn get_config(State(config): State<Arc<Config>>) -> Json<ConfigResponse> {
     Json(ConfigResponse {
-        allow_registration: true, // Default to true for template
+        allow_registration: config.allow_registration,
     })
 }