Fix Feishu MCP npx resolution

backend/api/server.py

@@ -2283,15 +2283,27 @@ def _feishu_paths(state: AgentState, account_id: str | None) -> dict[str, Path]:
 
 def _feishu_command() -> list[str]:
     return [
-        'npx',
+        _feishu_npx_executable(),
         '-y',
         f'--registry={FEISHU_NPM_REGISTRY}',
         FEISHU_MCP_PACKAGE,
     ]
 
 
+def _feishu_npx_executable() -> str:
+    explicit = os.environ.get('CLAW_NPX_BIN')
+    if explicit and Path(explicit).expanduser().exists():
+        return str(Path(explicit).expanduser())
+    node_bin_dir = os.environ.get('CLAW_NODE_BIN_DIR')
+    if node_bin_dir:
+        candidate = Path(node_bin_dir).expanduser() / 'npx'
+        if candidate.exists():
+            return str(candidate)
+    return shutil.which('npx') or 'npx'
+
+
 def _feishu_env(paths: dict[str, Path]) -> dict[str, str]:
-    return {
+    env = {
         'HOME': str(paths['home']),
         'XDG_CONFIG_HOME': str(paths['config']),
         'npm_config_cache': str(paths['npm_cache']),
@@ -2299,6 +2311,10 @@ def _feishu_env(paths: dict[str, Path]) -> dict[str, str]:
         'NO_UPDATE_NOTIFIER': 'true',
         'FEISHU_LOGIN_MODE': 'devicecode',
     }
+    node_bin_dir = os.environ.get('CLAW_NODE_BIN_DIR')
+    if node_bin_dir:
+        env['PATH'] = f'{node_bin_dir}{os.pathsep}{os.environ.get("PATH", "")}'
+    return env
 
 
 def _run_feishu_cli(