feat: clone OpenSIN-Code repo at runtime if missing

- Add git clone in start.sh using GITHUB_TOKEN
- Ensure REPO_DIR is set correctly
- Fail fast if GITHUB_TOKEN not set
- Update opencode config with correct model: opencode/qwen3.6-plus-free

start.sh

@@ -22,9 +22,20 @@ for path in "${REPO_PATHS[@]}"; do
     fi
 done
 
+# If not found, clone it using GITHUB_TOKEN
 if [ -z "$REPO_DIR" ]; then
-    echo "⚠️  No repository found. Clone it manually if needed."
+    echo "⚠️  No repository found. Cloning OpenSIN-Code..."
+    mkdir -p /workspace
+    if [ -n "$GITHUB_TOKEN" ]; then
+        echo "🔑 Using GITHUB_TOKEN for authentication"
+        git clone "https://x-access-token:${GITHUB_TOKEN}@github.com/OpenSIN-AI/OpenSIN-Code.git" /workspace/OpenSIN-Code
+    else
+        echo "❌ GITHUB_TOKEN not set - cannot clone repository"
+        echo "   Please set GITHUB_TOKEN in Space secrets"
+        exit 1
+    fi
     REPO_DIR="/workspace/OpenSIN-Code"
+    echo "✅ Repository cloned to $REPO_DIR"
 fi
 
 # Export for Python code
@@ -35,7 +46,8 @@ mkdir -p ~/.config/opencode
 if [ ! -f ~/.config/opencode/opencode.json ]; then
   cat > ~/.config/opencode/opencode.json << 'EOF'
 {
-  "model": "openai/gpt-5.4",
+  "model": "opencode/qwen3.6-plus-free",
+  "fallback": "opencode/minimax-m2.5-free",
   "provider": {
     "openai": {
       "options": {