fix: add license headers and correct selector syntax

- Add Apache 2.0 license headers to CUE schema files
- Fix #selector to use _kind: #kind pattern instead of hardcoded kind field
- Resolves schema validation error and license check failures

Signed-off-by: Aviral Garg <waysorted@gmail.com>
Signed-off-by: aviralgarg05 <gargaviral99@gmail.com>

Author: aviralgarg05

opengemini/schemas/datasources/opengemini-datasource/opengemini-datasource.cue

@@ -1,13 +1,26 @@
+// Copyright The Perses Authors
+// 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.
+
 package model
 
 import (
 	"github.com/perses/perses/cue/common"
 	commonProxy "github.com/perses/perses/cue/common/proxy"
 )
 
-kind: "OpenGeminiDatasource"
+kind: #kind
 spec: commonProxy.#baseHTTPDatasourceSpec
 
-#selector: common.#datasourceSelector & {
-	kind: "OpenGeminiDatasource"
-}
+#kind: "OpenGeminiDatasource"
+
+#selector: common.#datasourceSelector & { _kind: #kind }

opengemini/schemas/queries/opengemini-time-series-query/query.cue

@@ -1,3 +1,16 @@
+// Copyright The Perses Authors
+// 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.
+
 package model
 
 import (