feat: scaffold work queue API

internal/api/middleware.go

@@ -0,0 +1,34 @@
+package api
+
+import (
+	"encoding/json"
+	"net/http"
+	"time"
+)
+
+func jsonMiddleware(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		next.ServeHTTP(w, r)
+	})
+}
+
+func decodeJSON(r *http.Request, dst any) error {
+	defer r.Body.Close()
+	dec := json.NewDecoder(r.Body)
+	dec.DisallowUnknownFields()
+	return dec.Decode(dst)
+}
+
+func writeJSON(w http.ResponseWriter, status int, value any) {
+	w.WriteHeader(status)
+	_ = json.NewEncoder(w).Encode(value)
+}
+
+func writeError(w http.ResponseWriter, status int, msg string) {
+	writeJSON(w, status, map[string]string{"error": msg})
+}
+
+func nowUTC() time.Time {
+	return time.Now().UTC().Truncate(time.Second)
+}