chore: version 1.0.0-internal.0 for first scoped publish

Mirrors the flagsmith-js-client approach (11.0.0-internal.0 ... .7 before
11.0.0) so the initial scoped publish can validate the npm + trusted
publisher setup under a separate dist-tag before claiming `latest`.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: kyle-ssg

.release-please-manifest.json

@@ -1 +1 @@
-{".":"1.0.0"}
+{".":"1.0.0-internal.0"}

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@flagsmith/cli",
-  "version": "1.0.0",
+  "version": "1.0.0-internal.0",
   "description": "A CLI allowing you to fetch Flagsmith flags and output them to a file",
   "author": "kyle-ssg @kyle-ssg",
   "bin": {