fix: use relative paths in rsbuild-plugin rollup config

Match the path format used by other packages like data-prefetch
which use 'packages/package-name/src/...' relative paths.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: ScriptedAlchemy

packages/rsbuild-plugin/rollup.config.js

@@ -1,5 +1,4 @@
 const copy = require('rollup-plugin-copy');
-const path = require('path');
 
 module.exports = (rollupConfig, _projectOptions) => {
   rollupConfig.plugins.push(
@@ -17,18 +16,9 @@ module.exports = (rollupConfig, _projectOptions) => {
   rollupConfig.external = [/@module-federation/, '@rsbuild/core'];
 
   rollupConfig.input = {
-    index: path.resolve(
-      process.cwd(),
-      './packages/rsbuild-plugin/src/cli/index.ts',
-    ),
-    utils: path.resolve(
-      process.cwd(),
-      './packages/rsbuild-plugin/src/utils/index.ts',
-    ),
-    constant: path.resolve(
-      process.cwd(),
-      './packages/rsbuild-plugin/src/constant.ts',
-    ),
+    index: 'packages/rsbuild-plugin/src/cli/index.ts',
+    utils: 'packages/rsbuild-plugin/src/utils/index.ts',
+    constant: 'packages/rsbuild-plugin/src/constant.ts',
   };
 
   rollupConfig.output.forEach((output) => {