fix(openclaw): resolve installation failure on Windows with spaces in path (#12977)

### What this PR does

Before this PR:
- OpenClaw installation/uninstallation failed on Windows when the npm
command path contained spaces (e.g., "C:\Program Files\nodejs\npm.cmd").

After this PR:
- OpenClawService.install() and OpenClawService.uninstall() use spawn
with shell: true when the npm path contains spaces, fixing the Windows
installation failure.

Fixes #12945, #12935, #12963

### Why we need it and why it was done in this way

- Using spawn with shell:true for npm paths containing spaces ensures
the command is executed correctly on Windows without changing
crossPlatformSpawn or other callers.
- Scope limited to install() and uninstall() to minimize impact.

### Breaking changes

- None.

### Special notes for your reviewer

- Change is minimal and targeted to OpenClawService install/uninstall
logic.

### Checklist

- [x] PR: The PR description is expressive enough and will help future
contributors
- [x] Code: Write code that humans can understand and Keep it simple
- [ ] Refactor: Left the code cleaner than you found it
- [ ] Upgrade: Impact of this change on upgrade flows was considered
- [x] Documentation: No user-guide update required

Release note

```release-note
fix(openclaw): handle npm paths with spaces on Windows during install/uninstall
```

src/main/services/OpenClawService.ts

@@ -247,14 +247,18 @@ class OpenClawService {
     // Keep the command string for logging and sudo retry
     const npmCommand = `"${npmPath}" install -g ${packageName} ${registryArg}`.trim()
 
-    logger.info(`Installing OpenClaw with command: ${npmPath} ${npmArgs.join(' ')}`)
-    this.sendInstallProgress(`Running: ${npmPath} ${npmArgs.join(' ')}`)
+    // On Windows, wrap npm path in quotes if it contains spaces and is not already quoted
+    const needsQuotes = isWin && npmPath.includes(' ') && !npmPath.startsWith('"')
+    const processedNpmPath = needsQuotes ? `"${npmPath}"` : npmPath
+
+    logger.info(`Installing OpenClaw with command: ${processedNpmPath} ${npmArgs.join(' ')}`)
+    this.sendInstallProgress(`Running: ${processedNpmPath} ${npmArgs.join(' ')}`)
 
     const spawnEnv = await getShellEnv()
 
     return new Promise((resolve) => {
       try {
-        const installProcess = crossPlatformSpawn(npmPath, npmArgs, { env: spawnEnv })
+        const installProcess = crossPlatformSpawn(processedNpmPath, npmArgs, { env: spawnEnv })
 
         let stderr = ''
 
@@ -346,14 +350,18 @@ class OpenClawService {
     // Keep the command string for logging and sudo retry
     const npmCommand = `"${npmPath}" uninstall -g openclaw @qingchencloud/openclaw-zh`
 
-    logger.info(`Uninstalling OpenClaw with command: ${npmPath} ${npmArgs.join(' ')}`)
-    this.sendInstallProgress(`Running: ${npmPath} ${npmArgs.join(' ')}`)
+    // On Windows, wrap npm path in quotes if it contains spaces and is not already quoted
+    const needsQuotes = isWin && npmPath.includes(' ') && !npmPath.startsWith('"')
+    const processedNpmPath = needsQuotes ? `"${npmPath}"` : npmPath
+
+    logger.info(`Uninstalling OpenClaw with command: ${processedNpmPath} ${npmArgs.join(' ')}`)
+    this.sendInstallProgress(`Running: ${processedNpmPath} ${npmArgs.join(' ')}`)
 
     const shellEnv = await getShellEnv()
 
     return new Promise((resolve) => {
       try {
-        const uninstallProcess = crossPlatformSpawn(npmPath, npmArgs, { env: shellEnv })
+        const uninstallProcess = crossPlatformSpawn(processedNpmPath, npmArgs, { env: shellEnv })
 
         let stderr = ''