feat(w1): maven skeleton + CI scaffold

- Parent POM: de.platesoft:plate-auth-parent with ${revision} CI-friendly versioning
- plate-auth-starter module: Spring Boot 4.1.0 starter deps (web, jpa, security, validation, jwt, flyway, envers)
- @platesoft/auth npm package skeleton: tsup bundler, conditional exports, TypeScript strict
- Gitea Actions: ci.yml (on push/PR) + release.yml (on v* tag)
- distributionManagement pointing to Gitea Package Registry (Maven + npm)
- Apache-2.0 LICENSE, README with quickstart, CHANGELOG, .editorconfig, .gitignore
- pnpm workspace with packages/auth
- Maven BUILD SUCCESS verified locally

package.json

@@ -0,0 +1,15 @@
+{
+  "name": "plate-auth",
+  "private": true,
+  "version": "0.1.0",
+  "description": "plate-auth monorepo workspace root",
+  "scripts": {
+    "build": "pnpm -r build",
+    "test": "pnpm -r test",
+    "lint": "pnpm -r lint"
+  },
+  "engines": {
+    "node": ">=22.0.0",
+    "pnpm": ">=9.0.0"
+  }
+}