fix google auth: use Authorization Bearer for OpenAI-compatible endpoint

.opencode/opencode.json

@@ -1,4 +1,5 @@
 {
+  "$schema": "https://opencode.ai/config.json",
   "plugin": [
     ".opencode/plugins/graphify.js"
   ]

proxy/providers.py

@@ -24,8 +24,8 @@ PROVIDERS: dict[str, Provider] = {
     "google": Provider(
         name="google",
         base_url="https://generativelanguage.googleapis.com/v1beta/openai",
-        auth_header="x-goog-api-key",
-        auth_value=lambda key: key,
+        auth_header="Authorization",
+        auth_value=lambda key: f"Bearer {key}",
         handles_202=False,
         env_real_key="REAL_GOOGLE_KEY",
     ),