fix(cli): add peerDependencyRules for standalone pnpm projects

When `vp create` or `vp migrate` sets up a standalone pnpm project, only
`pnpm.overrides` was written to package.json. This caused noisy unmet
peer dependency warnings because packages expecting `vite` saw the
vite-plus version instead. Add `pnpm.peerDependencyRules` (allowAny +
allowedVersions) alongside overrides to suppress these warnings, matching
the behavior already present for monorepo projects via
rewritePnpmWorkspaceYaml().

Author: fengmk2

packages/cli/snap-tests-global/migration-standalone-pnpm/.gitignore

@@ -0,0 +1 @@
+node_modules/

packages/cli/snap-tests-global/migration-standalone-pnpm/package.json

@@ -0,0 +1,7 @@
+{
+  "name": "migration-standalone-pnpm",
+  "devDependencies": {
+    "vite": "^7.0.0",
+    "vitest": "^4.0.0"
+  }
+}

packages/cli/snap-tests-global/migration-standalone-pnpm/snap.txt

@@ -0,0 +1,34 @@
+> vp migrate --no-interactive --no-hooks --package-manager pnpm # migration should work with pnpm, add overrides and peerDependencyRules
+VITE+ - The Unified Toolchain for the Web
+
+◇ Migrated . to Vite+<repeat>
+• Node <semver>  pnpm <semver>
+✓ Dependencies installed in <variable>ms
+• 1 config update applied
+
+> cat package.json # check package.json has pnpm.overrides and pnpm.peerDependencyRules
+{
+  "name": "migration-standalone-pnpm",
+  "devDependencies": {
+    "vite": "npm:@voidzero-dev/vite-plus-core@latest",
+    "vitest": "npm:@voidzero-dev/vite-plus-test@latest",
+    "vite-plus": "latest"
+  },
+  "packageManager": "pnpm@<semver>",
+  "pnpm": {
+    "overrides": {
+      "vite": "npm:@voidzero-dev/vite-plus-core@latest",
+      "vitest": "npm:@voidzero-dev/vite-plus-test@latest"
+    },
+    "peerDependencyRules": {
+      "allowAny": [
+        "vite",
+        "vitest"
+      ],
+      "allowedVersions": {
+        "vite": "*",
+        "vitest": "*"
+      }
+    }
+  }
+}

packages/cli/snap-tests-global/migration-standalone-pnpm/steps.json

@@ -0,0 +1,12 @@
+{
+  "ignoredPlatforms": ["win32"],
+  "env": {
+    "VITE_DISABLE_AUTO_INSTALL": "1",
+    "CI": "",
+    "VP_SKIP_INSTALL": ""
+  },
+  "commands": [
+    "vp migrate --no-interactive --no-hooks --package-manager pnpm # migration should work with pnpm, add overrides and peerDependencyRules",
+    "cat package.json # check package.json has pnpm.overrides and pnpm.peerDependencyRules"
+  ]
+}

packages/cli/src/migration/migrator.ts

@@ -698,10 +698,10 @@ export function rewriteStandaloneProject(
     scripts?: Record<string, string>;
     pnpm?: {
       overrides?: Record<string, string>;
-      // peerDependencyRules?: {
-      //   allowAny?: string[];
-      //   allowedVersions?: Record<string, string>;
-      // };
+      peerDependencyRules?: {
+        allowAny?: string[];
+        allowedVersions?: Record<string, string>;
+      };
     };
   }>(packageJsonPath, (pkg) => {
     if (packageManager === PackageManager.yarn) {
@@ -715,17 +715,27 @@ export function rewriteStandaloneProject(
         ...VITE_PLUS_OVERRIDE_PACKAGES,
       };
     } else if (packageManager === PackageManager.pnpm) {
+      const overrideKeys = Object.keys(VITE_PLUS_OVERRIDE_PACKAGES);
       pkg.pnpm = {
         ...pkg.pnpm,
         overrides: {
           ...pkg.pnpm?.overrides,
           ...VITE_PLUS_OVERRIDE_PACKAGES,
           ...(isForceOverrideMode() ? { [VITE_PLUS_NAME]: VITE_PLUS_VERSION } : {}),
         },
+        peerDependencyRules: {
+          allowAny: [
+            ...new Set([...(pkg.pnpm?.peerDependencyRules?.allowAny ?? []), ...overrideKeys]),
+          ],
+          allowedVersions: {
+            ...pkg.pnpm?.peerDependencyRules?.allowedVersions,
+            ...Object.fromEntries(overrideKeys.map((key) => [key, '*'])),
+          },
+        },
       };
       // remove packages from `resolutions` field if they exist
       // https://pnpm.io/9.x/package_json#resolutions
-      for (const key of [...Object.keys(VITE_PLUS_OVERRIDE_PACKAGES), ...REMOVE_PACKAGES]) {
+      for (const key of [...overrideKeys, ...REMOVE_PACKAGES]) {
         if (pkg.resolutions?.[key]) {
           delete pkg.resolutions[key];
         }