feat: Integrate Kokoro TTS with WebGPU and fallback

.devcontainer/Dockerfile

@@ -0,0 +1,19 @@
+FROM node:18
+
+# Install basic development tools
+RUN apt update && apt install -y less git procps
+
+# Install Kokoro JS dependencies if needed
+RUN apt install -y build-essential python3
+
+# Ensure default `node` user has access to `sudo`
+ARG USERNAME=node
+RUN apt-get install -y sudo \
+    && echo $USERNAME ALL=\(root\) NOPASSWD:ALL > /etc/sudoers.d/$USERNAME \
+    && chmod 0440 /etc/sudoers.d/$USERNAME
+
+# Set the default user
+USER node
+
+# Set working directory
+WORKDIR /workspace