refactor(api): split Axum handlers into handler/service/repo modules

Keep the REST contract; move domain logic out of route files so checkout, fulfillment, and identity can be reused across customer, shop, and admin surfaces.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/api/src/modules/health.rs

@@ -0,0 +1,27 @@
+use axum::{extract::State, routing::get, Json, Router};
+use redis::AsyncCommands;
+use serde_json::{json, Value};
+
+use crate::error::ApiResult;
+use crate::state::AppState;
+
+pub fn router() -> Router<AppState> {
+    Router::new().route("/ready", get(ready))
+}
+
+pub async fn health() -> Json<Value> {
+    Json(json!({ "status": "ok" }))
+}
+
+pub async fn ready(State(state): State<AppState>) -> ApiResult<Json<Value>> {
+    let db_ok = sqlx::query_scalar::<_, i32>("SELECT 1")
+        .fetch_one(&state.db)
+        .await
+        .is_ok();
+    let mut redis = state.redis.clone();
+    let redis_ok = redis
+        .set::<_, _, ()>("vmall:ready:ping", "1")
+        .await
+        .is_ok();
+    Ok(Json(json!({ "db": db_ok, "redis": redis_ok })))
+}