Beam: full Apache 2.0 header in beam.c

App/app/beam.c

@@ -1,6 +1,17 @@
-/* Copyright 2026
+/* Copyright 2026 Armel F4HWN
+ * https://github.com/armel
  *
- * Licensed under the Apache License, Version 2.0.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *     Unless required by applicable law or agreed to in writing, software
+ *     distributed under the License is distributed on an "AS IS" BASIS,
+ *     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *     See the License for the specific language governing permissions and
+ *     limitations under the License.
  */
 
 #ifdef ENABLE_FEAT_F4HWN_BEAM