feat: add /api/models route with dynamic Claude model discovery

server/routes/models.js

@@ -0,0 +1,60 @@
+/**
+ * /api/models routes
+ *
+ * Returns available model lists for each provider.
+ * Claude models are fetched live from MODELS_API_BASE_URL/v1/models
+ * (9router) and cached for 5 minutes; other providers use their
+ * static constants.
+ */
+
+import express from 'express';
+import { getAvailableClaudeModels, invalidateModelCache } from '../services/model-discovery.js';
+import { CODEX_MODELS, CURSOR_MODELS, GEMINI_MODELS } from '../../shared/modelConstants.js';
+
+const router = express.Router();
+
+/**
+ * GET /api/models
+ * Returns all providers' model lists.
+ * Claude list is dynamically fetched from 9router when configured.
+ */
+router.get('/', async (_req, res) => {
+  try {
+    const claudeModels = await getAvailableClaudeModels();
+
+    res.json({
+      claude:  claudeModels,
+      codex:   CODEX_MODELS.OPTIONS,
+      gemini:  GEMINI_MODELS.OPTIONS,
+      cursor:  CURSOR_MODELS.OPTIONS,
+    });
+  } catch (err) {
+    console.error('[/api/models] Error:', err?.message ?? err);
+    res.status(500).json({ error: 'Failed to load model list' });
+  }
+});
+
+/**
+ * GET /api/models/claude
+ * Returns only Claude model list (with 9router discovery).
+ */
+router.get('/claude', async (_req, res) => {
+  try {
+    const models = await getAvailableClaudeModels();
+    res.json({ models });
+  } catch (err) {
+    console.error('[/api/models/claude] Error:', err?.message ?? err);
+    res.status(500).json({ error: 'Failed to load Claude model list' });
+  }
+});
+
+/**
+ * POST /api/models/refresh
+ * Force-invalidates the model cache (admin convenience endpoint).
+ */
+router.post('/refresh', (_req, res) => {
+  invalidateModelCache();
+  res.json({ success: true, message: 'Model cache invalidated' });
+});
+
+export default router;