fix(plugins): avoid managed npm prefix on Windows

Fixes #78514.

src/plugins/install.npm-spec.test.ts

@@ -69,8 +69,6 @@ function expectNpmInstallIntoRoot(params: { calls: unknown[][]; npmRoot: string
     "--ignore-scripts",
     "--no-audit",
     "--no-fund",
-    "--prefix",
-    ".",
   ]);
 }
 
@@ -290,9 +288,7 @@ function mockNpmViewAndInstallMany(packages: MockNpmPackage[]) {
         );
       }
       if (argv[0] === "npm" && argv[1] === "install") {
-        const prefixIndex = argv.indexOf("--prefix");
-        const prefixValue = prefixIndex >= 0 ? argv[prefixIndex + 1] : undefined;
-        const npmRoot = prefixValue === "." ? options?.cwd : prefixValue;
+        const npmRoot = options?.cwd;
         if (!npmRoot) {
           throw new Error(`unexpected npm install command: ${argv.join(" ")}`);
         }
@@ -345,9 +341,7 @@ function mockNpmViewAndInstallMany(packages: MockNpmPackage[]) {
       if (argv[0] === "npm" && argv[1] === "uninstall") {
         const packageName = argv.at(-1);
         if (packageName === "openclaw") {
-          const prefixIndex = argv.indexOf("--prefix");
-          const prefixValue = prefixIndex >= 0 ? argv[prefixIndex + 1] : undefined;
-          const npmRoot = prefixValue === "." ? options?.cwd : prefixValue;
+          const npmRoot = options?.cwd;
           if (!npmRoot) {
             throw new Error(`unexpected npm uninstall command: ${argv.join(" ")}`);
           }

src/plugins/install.ts

@@ -328,8 +328,6 @@ async function rollbackManagedNpmPluginInstall(params: {
         "--ignore-scripts",
         "--no-audit",
         "--no-fund",
-        "--prefix",
-        ".",
         params.packageName,
       ],
       {
@@ -499,8 +497,6 @@ async function installPluginFromManagedNpmRoot(
         noAudit: true,
         noFund: true,
       }),
-      "--prefix",
-      ".",
     ],
     {
       cwd: npmRoot,

src/plugins/uninstall.test.ts

@@ -992,8 +992,6 @@ describe("uninstallPlugin", () => {
         "--ignore-scripts",
         "--no-audit",
         "--no-fund",
-        "--prefix",
-        ".",
         "@openclaw/kitchen-sink",
       ],
       expect.objectContaining({
@@ -1128,8 +1126,6 @@ describe("uninstallPlugin", () => {
         "--ignore-scripts",
         "--no-audit",
         "--no-fund",
-        "--prefix",
-        ".",
         "missing-plugin",
       ],
       expect.objectContaining({

src/plugins/uninstall.ts

@@ -611,8 +611,6 @@ export async function applyPluginUninstallDirectoryRemoval(
         "--ignore-scripts",
         "--no-audit",
         "--no-fund",
-        "--prefix",
-        ".",
         removal.cleanup.packageName,
       ],
       {