feat: Implement a new layered architecture for the QR generator, integrating Axum, Maud, and HTMX, and updating documentation.

backend/src/infrastructure/http/handlers.rs

@@ -0,0 +1,28 @@
+use crate::application::generate_qr::GenerateQrUseCase;
+use crate::domain::qr::QrOptions;
+use crate::infrastructure::http::views::{index_page, qr_component};
+use axum::{
+    extract::{Query, State},
+    response::IntoResponse,
+};
+use std::collections::HashMap;
+use std::sync::Arc;
+
+pub async fn index() -> impl IntoResponse {
+    index_page()
+}
+
+pub async fn generate(
+    State(use_case): State<Arc<GenerateQrUseCase>>,
+    Query(params): Query<HashMap<String, String>>,
+) -> impl IntoResponse {
+    let data = params.get("data").cloned().unwrap_or_default();
+
+    // Simple options for now, can be extended to parse from params
+    let options = QrOptions::default();
+
+    match use_case.execute(data, options).await {
+        Ok(image_data) => qr_component(&image_data).into_response(),
+        Err(e) => format!("<div class='error'>Error: {}</div>", e).into_response(),
+    }
+}