[feat] update some feature

sync code of  fastrtc,
add text support through datachannel,
fix safari connect problem
support chat without camera or mic

demo/llama_code_editor/assets/sandbox.html

@@ -0,0 +1,37 @@
+<div style="
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  min-height: 400px;
+  background: linear-gradient(135deg, #f5f7fa 0%, #e4e8ec 100%);
+  border-radius: 8px;
+  border: 2px dashed #cbd5e1;
+  padding: 2rem;
+  text-align: center;
+  color: #64748b;
+  font-family: system-ui, -apple-system, sans-serif;
+">
+  <div style="
+    width: 80px;
+    height: 80px;
+    margin-bottom: 1.5rem;
+    border: 3px solid #cbd5e1;
+    border-radius: 12px;
+    position: relative;
+  ">
+    <div style="
+      position: absolute;
+      top: 50%;
+      left: 50%;
+      transform: translate(-50%, -50%);
+      font-size: 2rem;
+    ">📦</div>
+  </div>
+  <h2 style="
+    margin: 0 0 0.5rem 0;
+    font-size: 1.5rem;
+    font-weight: 600;
+    color: #475569;
+  ">No Application Created</h2>
+</div>