fix(config): auto-install hooks without prompting in prepare script

When `vp config` runs from a package.json prepare script
(npm_lifecycle_event=prepare) in an interactive terminal, it was
incorrectly prompting the user for hooks setup confirmation. The
prepare script implies the project opted into hooks, so they should
be installed automatically.

Author: fengmk2

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

@@ -0,0 +1,3 @@
+{
+  "name": "command-config-prepare-auto-hooks"
+}

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

@@ -0,0 +1,4 @@
+> git init
+> vp config # should install hooks automatically without prompting
+> git config --local core.hooksPath # should be .vite-hooks/_
+.vite-hooks/_

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

@@ -0,0 +1,10 @@
+{
+  "env": {
+    "npm_lifecycle_event": "prepare"
+  },
+  "commands": [
+    { "command": "git init", "ignoreOutput": true },
+    "vp config # should install hooks automatically without prompting",
+    "git config --local core.hooksPath # should be .vite-hooks/_"
+  ]
+}

packages/cli/src/config/bin.ts

@@ -53,15 +53,17 @@ async function main() {
   const dir = args['hooks-dir'] as string | undefined;
   const hooksOnly = args['hooks-only'] as boolean;
   const interactive = defaultInteractive();
+  const isPrepareScript = process.env.npm_lifecycle_event === 'prepare';
   const root = process.cwd();
 
   // --- Step 1: Hooks setup ---
   const hooksDir = dir ?? '.vite-hooks';
   const isFirstHooksRun = !existsSync(join(root, hooksDir, '_', 'pre-commit'));
 
   let shouldSetupHooks = true;
-  if (interactive && isFirstHooksRun && !dir) {
+  if (interactive && isFirstHooksRun && !dir && !isPrepareScript) {
     // --hooks-dir implies agreement; only prompt when using default dir on first run
+    // prepare script implies the project opted into hooks — install automatically
     shouldSetupHooks = await promptGitHooks({ interactive });
   }