feat: add fullstack TypeScript template with Docker support

- Created package.json for managing workspaces (frontend and backend)
- Added scripts for development, build, testing, and Docker operations
- Implemented kill-dev-processes.sh script to terminate development processes gracefully

.vscode/extensions.json

@@ -0,0 +1,15 @@
+{
+  "recommendations": [
+    "ms-vscode.vscode-typescript-next",
+    "esbenp.prettier-vscode", 
+    "ms-vscode.vscode-json",
+    "ms-vscode.vscode-eslint",
+    "bradlc.vscode-tailwindcss",
+    "ms-vscode-remote.remote-containers",
+    "ms-vscode.node-debug2",
+    "ms-vscode.js-debug",
+    "formulahendry.auto-rename-tag",
+    "christian-kohler.path-intellisense",
+    "ms-vscode.vscode-typescript-tslint-plugin"
+  ]
+}