fix: extract provider from model name (e.g., chutes/model-name)

- Parse model names like 'chutes/deepseek-ai/DeepSeek-V3.2-TEE'
- Extract provider prefix before '/' to detect chutes, cerebras, etc.
- This fixes provider detection when admin panel sets wrong provider

chat/server.js

@@ -5149,6 +5149,15 @@ async function ensureOpencodeConfig(session) {
   // Find which providers are used in adminModels
   const usedProviders = new Set();
   for (const model of adminModels) {
+    // First, try to extract provider from model name (e.g., "chutes/model-name" -> "chutes")
+    if (model.name && model.name.includes('/')) {
+      const providerFromName = model.name.split('/')[0].toLowerCase();
+      if (providerFromName && providerFromName !== 'opencode') {
+        usedProviders.add(providerFromName);
+        log('Detected provider from model name', { name: model.name, provider: providerFromName });
+      }
+    }
+    
     if (Array.isArray(model.providers)) {
       for (const p of model.providers) {
         // Handle both string format ["opencode", "chutes"] and object format [{provider: "opencode"}]