feat(quota): add OpenCode Go usage tracking (#2155)

* feat(quota): add OpenCode Go usage tracking

* fix(quota): align OpenCode Go VS Code parsing

packages/web/server/lib/quota/routes.js

@@ -1,3 +1,13 @@
+import express from 'express';
+import {
+  deleteOpenCodeGoCredential,
+  getOpenCodeGoCredentialStatus,
+  normalizeOpenCodeGoCredential,
+  readOpenCodeGoCredential,
+  writeOpenCodeGoCredential,
+} from './opencode-go-credentials.js';
+import { fetchOpenCodeGoUsage } from './providers/opencode-go.js';
+
 export function registerQuotaRoutes(app, { getQuotaProviders }) {
   app.get('/api/quota/providers', async (_req, res) => {
     try {
@@ -10,6 +20,37 @@ export function registerQuotaRoutes(app, { getQuotaProviders }) {
     }
   });
 
+  app.get('/api/quota/credentials/opencode-go', (_req, res) => {
+    res.json(getOpenCodeGoCredentialStatus());
+  });
+
+  app.put('/api/quota/credentials/opencode-go', express.json({ limit: '16kb' }), async (req, res) => {
+    try {
+      const credential = normalizeOpenCodeGoCredential(req.body);
+      if (!credential) return res.status(400).json({ error: 'Workspace ID and auth cookie are required' });
+      await fetchOpenCodeGoUsage(credential);
+      res.json(writeOpenCodeGoCredential(credential));
+    } catch (error) {
+      res.status(400).json({ error: error instanceof Error ? error.message : 'Credential validation failed' });
+    }
+  });
+
+  app.post('/api/quota/credentials/opencode-go/validate', async (_req, res) => {
+    try {
+      const credential = readOpenCodeGoCredential();
+      if (!credential) return res.status(404).json({ error: 'Not configured' });
+      await fetchOpenCodeGoUsage(credential);
+      res.json({ valid: true });
+    } catch (error) {
+      res.status(400).json({ valid: false, error: error instanceof Error ? error.message : 'Credential validation failed' });
+    }
+  });
+
+  app.delete('/api/quota/credentials/opencode-go', (_req, res) => {
+    deleteOpenCodeGoCredential();
+    res.json({ configured: false });
+  });
+
   app.get('/api/quota/:providerId', async (req, res) => {
     try {
       const { providerId } = req.params;