fix(usage): track OpenCode Go quota (#3791)

OpenCode Go API-key connections now appear in the Quota Tracker and report rolling, weekly, and monthly subscription usage.

open-sse/providers/registry/opencode-go.js

@@ -21,6 +21,9 @@ export default {
   transport: {
     baseUrl: "https://opencode.ai/zen/go/v1/chat/completions",
     headers: {},
+    usage: {
+      url: "https://opencode.ai/zen/go/v1/usage",
+    },
   },
   // Multi-endpoint: pick the transport matching the client sourceFormat to skip
   // translation. Guarded per-model by `supportedFormats` (see chatCore) because
@@ -48,4 +51,8 @@ export default {
     { id: "qwen3.7-plus", name: "Qwen 3.7 Plus", supportedFormats: ["openai", "claude"] },
     { id: "qwen3.6-plus", name: "Qwen 3.6 Plus", supportedFormats: ["openai", "claude"] },
   ],
+  features: {
+    usage: true,
+    usageApikey: true,
+  },
 };