OZG-7324: Fix license header

.gitignore

Dockerfile

api/gateway-config.yml

api/openapi-config.yml

api/proto/fachstelleregistration.model.proto

api/proto/fachstelleregistration.proto

buf.gen.yaml

buf.yaml

cmd/fachstellen-proxy/main.go

internal/config/config.go

internal/config/config_test.go

internal/mock/grpc_server.go

internal/mock/grpc_server_test.go

internal/mock/test_setup.go

internal/mock/testdata/config.yml

internal/server/globals.go

internal/server/grpc_router.go

internal/server/grpc_router_test.go

internal/server/handler.go

internal/server/handler_test.go