refactor: move synthetic auth refs to manifests

extensions/anthropic/openclaw.plugin.json

@@ -6,6 +6,7 @@
     "modelPrefixes": ["claude-"]
   },
   "cliBackends": ["claude-cli"],
+  "syntheticAuthRefs": ["claude-cli"],
   "providerAuthEnvVars": {
     "anthropic": ["ANTHROPIC_OAUTH_TOKEN", "ANTHROPIC_API_KEY"]
   },

extensions/ollama/openclaw.plugin.json

@@ -3,6 +3,7 @@
   "enabledByDefault": true,
   "providers": ["ollama"],
   "providerDiscoveryEntry": "./provider-discovery.ts",
+  "syntheticAuthRefs": ["ollama"],
   "providerAuthEnvVars": {
     "ollama": ["OLLAMA_API_KEY"]
   },

extensions/xai/openclaw.plugin.json

@@ -2,6 +2,7 @@
   "id": "xai",
   "enabledByDefault": true,
   "providers": ["xai"],
+  "syntheticAuthRefs": ["xai"],
   "providerAuthEnvVars": {
     "xai": ["XAI_API_KEY"]
   },