build: use placeholder version for semantic-release

semantic-release manages the version at publish time, so the version
in package.json is not manually maintained. Use 1.999.0 as a
placeholder that satisfies any ^1.X.Y range in workspace consumers
without a prerelease suffix (which would break semver matching).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: arbrandes

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "@openedx/frontend-base",
-  "version": "1.0.0-alpha.14",
+  "version": "0.0.0-dev",
   "description": "Build tools, setup and config for frontend apps",
   "publishConfig": {
     "access": "public"