perf: use direct opencode binary path instead of npx

vite.config.ts

@@ -8,6 +8,8 @@ function apiSavePlugin() {
   return {
     name: 'api-save',
     configureServer(server: any) {
+      const opencodeBin = resolve(__dirname, 'node_modules', 'opencode-ai', 'bin', 'opencode.exe')
+
       server.middlewares.use('/api/save', (req: any, res: any) => {
         if (req.method !== 'POST') { res.writeHead(405); res.end(); return }
         let body = ''
@@ -36,7 +38,7 @@ function apiSavePlugin() {
       server.middlewares.use('/api/ai/sessions', (req: any, res: any) => {
         if (req.method !== 'GET') { res.writeHead(405); res.end(); return }
         try {
-          const child = spawn('npx', ['opencode', 'session', 'list', '--format', 'json'], { timeout: 5000, stdio: ['ignore', 'pipe', 'pipe'], shell: process.platform === 'win32' })
+          const child = spawn(opencodeBin, ['session', 'list', '--format', 'json'], { timeout: 5000, stdio: ['ignore', 'pipe', 'pipe'] })
           let stdout = ''
           let responded = false
           child.stdout.on('data', (d: Buffer) => stdout += d.toString())
@@ -81,15 +83,14 @@ function apiSavePlugin() {
               : 'JSON模式：只返回修改后的 JSON 文本，不要写任何文件。需求：'
             const fullMessage = modePrefix + userMessage
 
-            const args = ['opencode', 'run', '--model', 'deepseek/deepseek-v4-pro', '--format', 'json']
-            if (sessionId) args.splice(2, 0, '--session', sessionId)
+            const args = ['run', '--model', 'deepseek/deepseek-v4-pro', '--format', 'json']
+            if (sessionId) args.push('--session', sessionId)
             args.push(fullMessage)
 
-            const child = spawn('npx', args, {
+            const child = spawn(opencodeBin, args, {
               env: { ...process.env, DEEPSEEK_API_KEY: apiKey || process.env.DEEPSEEK_API_KEY || '' },
               timeout: 60000,
               stdio: ['ignore', 'pipe', 'pipe'],
-              shell: process.platform === 'win32',
             })
 
             let stdout = ''