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

.devcontainer/devcontainer.json

@@ -0,0 +1,25 @@
+{
+    "name": "Node.js Development",
+    "build": {
+        "dockerfile": "Dockerfile"
+    },
+    "customizations": {
+        "vscode": {
+            "extensions": [
+                "dbaeumer.vscode-eslint",
+                "esbenp.prettier-vscode"
+            ],
+            "settings": {
+                "terminal.integrated.defaultProfile.linux": "bash",
+                "terminal.integrated.profiles.linux": {
+                    "bash": {
+                        "path": "/bin/bash"
+                    }
+                }
+            }
+        }
+    },
+    "forwardPorts": [3001],
+    "postCreateCommand": "npm install",
+    "remoteUser": "node"
+}