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

.devcontainer/devcontainer.json

@@ -0,0 +1,42 @@
+{
+  "name": "Fotodrucker Full Stack",
+  "build": {
+    "dockerfile": "Dockerfile"
+  },
+  "workspaceFolder": "/workspace",
+  "workspaceMount": "source=${localWorkspaceFolder},target=/workspace,type=bind,consistency=cached",
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "ms-vscode.vscode-typescript-next",
+        "esbenp.prettier-vscode",
+        "ms-vscode.vscode-json",
+        "bradlc.vscode-tailwindcss",
+        "ms-vscode.vscode-eslint",
+        "ms-vscode-remote.remote-containers"
+      ],
+      "settings": {
+        "typescript.preferences.includePackageJsonAutoImports": "auto",
+        "editor.formatOnSave": true,
+        "editor.defaultFormatter": "esbenp.prettier-vscode"
+      }
+    }
+  },
+  "postCreateCommand": "cd backend && npm install && cd ../frontend && npm install",
+  "forwardPorts": [3000, 3001, 9229, 9230],
+  "portsAttributes": {
+    "3000": {
+      "label": "Frontend (React)",
+      "onAutoForward": "openBrowser"
+    },
+    "3001": {
+      "label": "Backend (Express)"
+    },
+    "9229": {
+      "label": "Backend Debug Port"
+    },
+    "9230": {
+      "label": "Frontend Debug Port"
+    }
+  }
+}