refactor: 统一版本号管理，消除硬编码

项目版本(pom.xml revision)和parser版本(parserVersion)统一为单一来源，
前端构建时自动同步，发版只需改根pom.xml的两个属性。

web-front/scripts/sync-version.js

@@ -0,0 +1,23 @@
+const fs = require('fs');
+const path = require('path');
+
+const pomPath = path.resolve(__dirname, '../../pom.xml');
+const pkgPath = path.resolve(__dirname, '../package.json');
+
+const pomContent = fs.readFileSync(pomPath, 'utf-8');
+const match = pomContent.match(/<revision>([^<]+)<\/revision>/);
+if (!match) {
+  console.error('sync-version: <revision> not found in root pom.xml');
+  process.exit(1);
+}
+
+const version = match[1];
+const pkg = JSON.parse(fs.readFileSync(pkgPath, 'utf-8'));
+if (pkg.version === version) {
+  console.log(`sync-version: package.json already at ${version}`);
+  process.exit(0);
+}
+
+pkg.version = version;
+fs.writeFileSync(pkgPath, JSON.stringify(pkg, null, 2) + '\n');
+console.log(`sync-version: package.json ${pkg.version} -> ${version}`);