Add app version display in Footer and implement version API endpoint

- Updated Footer.vue to show the application version for logged-in users.
- Added a new API endpoint to return the application version from package.json.
- Enhanced code-analysis.yml to require package version changes for main PRs.

server/api/app/version.get.js

@@ -0,0 +1,25 @@
+import { promises as fs } from 'fs'
+import path from 'path'
+import { getUserFromToken } from '../../utils/auth.js'
+
+async function readPackageVersion() {
+  const packageJsonPath = path.join(process.cwd(), 'package.json')
+  const packageJson = JSON.parse(await fs.readFile(packageJsonPath, 'utf8'))
+  return String(packageJson.version || '')
+}
+
+export default defineEventHandler(async (event) => {
+  const token = getCookie(event, 'auth_token')
+  const user = token ? await getUserFromToken(token) : null
+
+  if (!user) {
+    throw createError({
+      statusCode: 401,
+      statusMessage: 'Nicht authentifiziert'
+    })
+  }
+
+  return {
+    version: await readPackageVersion()
+  }
+})