feat(api): wire POST /tabs/parse endpoint with fetcher and parser

crates/api/src/routes/mod.rs

@@ -0,0 +1 @@
+pub mod tabs;

crates/api/src/routes/tabs.rs

@@ -0,0 +1,41 @@
+use axum::{extract::State, http::StatusCode, Json};
+use domain::{TabFetcherPort, TabParserPort, TabSource};
+use serde::{Deserialize, Serialize};
+use std::{path::PathBuf, sync::Arc};
+
+pub struct AppState {
+    pub fetcher: Box<dyn TabFetcherPort>,
+    pub parser: Box<dyn TabParserPort>,
+}
+
+#[derive(Deserialize)]
+pub struct ParseRequest {
+    pub source: String,
+}
+
+#[derive(Serialize)]
+pub struct ErrorResponse {
+    pub error: String,
+}
+
+pub async fn parse_tab(
+    State(state): State<Arc<AppState>>,
+    Json(body): Json<ParseRequest>,
+) -> Result<Json<domain::Song>, (StatusCode, Json<ErrorResponse>)> {
+    let source = if body.source.starts_with("file://") {
+        let path = body.source.trim_start_matches("file://");
+        TabSource::File(PathBuf::from(path))
+    } else {
+        TabSource::Url(body.source)
+    };
+
+    let html = state.fetcher.fetch(source).await.map_err(|e| {
+        (StatusCode::BAD_GATEWAY, Json(ErrorResponse { error: e.to_string() }))
+    })?;
+
+    let song = state.parser.parse(&html).map_err(|e| {
+        (StatusCode::UNPROCESSABLE_ENTITY, Json(ErrorResponse { error: e.to_string() }))
+    })?;
+
+    Ok(Json(song))
+}