feat(config): auto-create pre-commit hook and staged config

When `vp config` installs hooks and `.vite-hooks/pre-commit` does not
exist, automatically create it with `vp staged` and ensure the default
staged config (`{ '*': 'vp check --fix' }`) exists in vite.config.ts.
This mirrors the behavior of `vp create` and ensures the pre-commit
hook is functional out of the box.

Author: fengmk2

packages/cli/snap-tests-global/command-config-prepare-auto-hooks/snap.txt

@@ -2,3 +2,16 @@
 > vp config # should install hooks automatically without prompting
 > git config --local core.hooksPath # should be .vite-hooks/_
 .vite-hooks/_
+
+> cat .vite-hooks/pre-commit # should have vp staged
+vp staged
+
+> cat vite.config.ts # should have staged config
+import { defineConfig } from 'vite-plus';
+
+export default defineConfig({
+  staged: {
+    "*": "vp check --fix"
+  },
+  
+});

packages/cli/snap-tests-global/command-config-prepare-auto-hooks/steps.json

@@ -5,6 +5,8 @@
   "commands": [
     { "command": "git init", "ignoreOutput": true },
     "vp config # should install hooks automatically without prompting",
-    "git config --local core.hooksPath # should be .vite-hooks/_"
+    "git config --local core.hooksPath # should be .vite-hooks/_",
+    "cat .vite-hooks/pre-commit # should have vp staged",
+    "cat vite.config.ts # should have staged config"
   ]
 }

packages/cli/src/config/bin.ts

@@ -10,6 +10,11 @@ import { join } from 'node:path';
 import mri from 'mri';
 
 import { vitePlusHeader } from '../../binding/index.js';
+import {
+  createPreCommitHook,
+  hasStagedConfigInViteConfig,
+  mergeStagedConfigToViteConfig,
+} from '../migration/migrator.js';
 import { updateExistingAgentInstructions } from '../utils/agent.js';
 import { renderCliDoc } from '../utils/help.js';
 import { defaultInteractive, promptGitHooks } from '../utils/prompts.js';
@@ -75,6 +80,15 @@ async function main() {
         process.exit(1);
       }
     }
+
+    // Create pre-commit hook if missing, and ensure staged config exists
+    const preCommitPath = join(root, hooksDir, 'pre-commit');
+    if (!existsSync(preCommitPath)) {
+      if (!hasStagedConfigInViteConfig(root)) {
+        mergeStagedConfigToViteConfig(root, { '*': 'vp check --fix' }, true);
+      }
+      createPreCommitHook(root, hooksDir);
+    }
   }
 
   // --- Step 2: Update agent instructions if Vite+ header exists and is outdated ---

packages/cli/src/migration/migrator.ts

@@ -1394,7 +1394,7 @@ function mergeAndRemoveJsonConfig(
  * Merge a staged config object into vite.config.ts as `staged: { ... }`.
  * Writes the config to a temp JSON file, calls mergeJsonConfig NAPI, then cleans up.
  */
-function mergeStagedConfigToViteConfig(
+export function mergeStagedConfigToViteConfig(
   projectPath: string,
   stagedConfig: Record<string, string | string[]>,
   silent = false,
@@ -1440,7 +1440,7 @@ function mergeStagedConfigToViteConfig(
 /**
  * Check if vite.config.ts already has a `staged` config key.
  */
-function hasStagedConfigInViteConfig(projectPath: string): boolean {
+export function hasStagedConfigInViteConfig(projectPath: string): boolean {
   const configs = detectConfigs(projectPath);
   if (!configs.viteConfig) {
     return false;