test(pm): cover package manager detection for nested projects

crates/vp_cli_snapshots/tests/cli_snapshots/fixtures/command_env_nested_package_manager/.node-version

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+20.18.0

crates/vp_cli_snapshots/tests/cli_snapshots/fixtures/command_env_nested_package_manager/member-workspace.yaml

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+# Same settings, but svc/ is a workspace package.
+packages:
+  - svc
+onlyBuiltDependencies: []

crates/vp_cli_snapshots/tests/cli_snapshots/fixtures/command_env_nested_package_manager/package.json

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+{
+  "name": "command-env-nested-package-manager",
+  "private": true,
+  "packageManager": "pnpm@10.19.0"
+}

crates/vp_cli_snapshots/tests/cli_snapshots/fixtures/command_env_nested_package_manager/pnpm-workspace.yaml

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+# Settings only: svc/ is not a workspace package.
+onlyBuiltDependencies: []

crates/vp_cli_snapshots/tests/cli_snapshots/fixtures/command_env_nested_package_manager/prepare-npm.cjs

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+const { mkdirSync, writeFileSync } = require('node:fs')
+const { join } = require('node:path')
+
+const binRoot = join(
+  process.env.VP_HOME,
+  'package_manager',
+  'npm',
+  '10.9.4',
+  'npm',
+  'bin',
+)
+const extension = process.platform === 'win32' ? '.cmd' : ''
+const contents = process.platform === 'win32' ? '@echo off\r\n' : '#!/bin/sh\n'
+
+mkdirSync(binRoot, { recursive: true })
+for (const name of ['npm', 'npx'])
+  writeFileSync(join(binRoot, `${name}${extension}`), contents, { mode: 0o755 })

crates/vp_cli_snapshots/tests/cli_snapshots/fixtures/command_env_nested_package_manager/snapshots.toml

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+# https://github.com/voidzero-dev/vite-plus/issues/3013
+[[case]]
+name = "command_env_nested_package_manager"
+vp = "global"
+steps = [
+  { argv = ["node", "prepare-npm.cjs"], snapshot = false },
+  { argv = ["vp", "env", "current", "pm", "--json"], cwd = "svc", comment = "a nested project outside the workspace packages uses its own packageManager" },
+  { argv = ["vpt", "cp", "member-workspace.yaml", "pnpm-workspace.yaml"], snapshot = false },
+  { argv = ["vp", "env", "current", "pm", "--json"], cwd = "svc", comment = "a workspace package uses the workspace's packageManager, even when it declares its own" },
+]

crates/vp_cli_snapshots/tests/cli_snapshots/fixtures/command_env_nested_package_manager/snapshots/command_env_nested_package_manager.md

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+# command_env_nested_package_manager
+
+## `node prepare-npm.cjs`
+
+
+## `cd svc && vp env current pm --json`
+
+a nested project outside the workspace packages uses its own packageManager
+
+```
+{
+  "package_manager": {
+    "name": "npm",
+    "version": "<version>",
+    "source": "packageManager",
+    "source_path": "<workspace>/svc/package.json",
+    "project_root": "<workspace>/svc",
+    "bin_paths": {
+      "npm": "<home>/.vite-plus/package_manager/npm/<version>/npm/bin/npm",
+      "npx": "<home>/.vite-plus/package_manager/npm/<version>/npm/bin/npx"
+    },
+    "installed": true,
+    "mode": "managed"
+  }
+}
+```
+
+## `vpt cp member-workspace.yaml pnpm-workspace.yaml`
+
+
+## `cd svc && vp env current pm --json`
+
+a workspace package uses the workspace's packageManager, even when it declares its own
+
+```
+{
+  "package_manager": {
+    "name": "pnpm",
+    "version": "<version>",
+    "source": "packageManager",
+    "source_path": "<workspace>/package.json",
+    "project_root": "<workspace>",
+    "bin_paths": {
+      "pnpm": "<home>/.vite-plus/package_manager/pnpm/<version>/pnpm/bin/pnpm",
+      "pnpx": "<home>/.vite-plus/package_manager/pnpm/<version>/pnpm/bin/pnpx"
+    },
+    "installed": false,
+    "mode": "managed"
+  }
+}
+```

crates/vp_cli_snapshots/tests/cli_snapshots/fixtures/command_env_nested_package_manager/svc/package.json

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+{
+  "name": "svc",
+  "private": true,
+  "packageManager": "npm@10.9.4"
+}