chore: use standard Apache license header in NOTICE

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

NOTICE

@@ -1,5 +1,14 @@
-@haylan/opencode-fastcrw
 Copyright 2026 Arthur Erlich
 
-This product includes software developed by Arthur Erlich
+Licensed under the Apache License, Version 2.0 (the "License");
-(https://git.arthurerlich.de/haylan/fastcrw-opencode-websearch).
+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.
+