feat: add vpr alias hint in vp -h help and add snap test

Show "(also available as standalone `vpr`)" next to the `run` command
in the top-level help output. Add snap test for the `vpr` command
verifying script execution, argument passthrough, and missing script
error via PM fallback.

Author: fengmk2

crates/vite_global_cli/src/help.rs

@@ -449,7 +449,7 @@ pub fn top_level_help_doc() -> HelpDoc {
             section_rows(
                 "Execute",
                 vec![
-                    row("run", "Run tasks"),
+                    row("run", "Run tasks (also available as standalone `vpr`)"),
                     row("exec", "Execute a command from local node_modules/.bin"),
                     row("dlx", "Execute a package binary without installing it as a dependency"),
                     row("cache", "Manage the task cache"),

packages/cli/snap-tests-global/cli-helper-message/snap.txt

@@ -19,7 +19,7 @@ Develop:
   test   Run tests
 
 Execute:
-  run    Run tasks
+  run    Run tasks (also available as standalone `vpr`)
   exec   Execute a command from local node_modules/.bin
   dlx    Execute a package binary without installing it as a dependency
   cache  Manage the task cache

packages/cli/snap-tests-global/command-vpr/package.json

@@ -0,0 +1,9 @@
+{
+  "name": "command-vpr",
+  "version": "1.0.0",
+  "scripts": {
+    "hello": "echo hello from script",
+    "greet": "echo greet"
+  },
+  "packageManager": "pnpm@10.19.0"
+}

packages/cli/snap-tests-global/command-vpr/snap.txt

@@ -0,0 +1,18 @@
+> vpr hello # should fall back to pnpm run when no vite-plus dependency
+
+> command-vpr@<semver> hello <cwd>
+> echo hello from script
+
+hello from script
+
+> vpr greet --arg1 value1 # should pass through args to pnpm run
+
+> command-vpr@<semver> greet <cwd>
+> echo greet --arg1 value1
+
+greet --arg1 value1
+
+[1]> vpr nonexistent # should show pnpm missing script error
+ ERR_PNPM_NO_SCRIPT  Missing script: nonexistent
+
+Command "nonexistent" not found.

packages/cli/snap-tests-global/command-vpr/steps.json

@@ -0,0 +1,8 @@
+{
+  "ignoredPlatforms": ["win32"],
+  "commands": [
+    "vpr hello # should fall back to pnpm run when no vite-plus dependency",
+    "vpr greet --arg1 value1 # should pass through args to pnpm run",
+    "vpr nonexistent # should show pnpm missing script error"
+  ]
+}