feat: add node help system and registry for extensible node types

- Implemented a help system for different node types (config, render, variable, function) with detailed usage instructions.
- Created a node registry to manage node types, including registration, retrieval, and validation of connections between nodes.
- Defined central node and edge types for the application to streamline state management.
- Added Nunjucks autocomplete functionality to enhance user experience in template editing.
- Developed a syntax highlighting parser for PlantUML and Nunjucks within the CodeMirror editor.
- Registered built-in node types at application startup, including their default configurations and help entries.
- Introduced a theme context provider to manage light/dark mode preferences across the application.
- Created utility functions for class name management using clsx and tailwind-merge.
- Set up Tailwind CSS for styling with custom themes and responsive design.
- Configured Vite for development with proxy settings for backend API calls and Kroki diagram service.

frontend/package.json

@@ -0,0 +1,46 @@
+{
+  "name": "reactflow-shadcn-app",
+  "version": "0.1.0",
+  "private": true,
+  "scripts": {
+    "dev": "vite",
+    "build": "vite build",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "@codemirror/lang-javascript": "^6.2.2",
+    "@codemirror/lang-markdown": "^6.5.0",
+    "@radix-ui/react-context-menu": "^2.2.16",
+    "@radix-ui/react-menubar": "^1.1.16",
+    "@radix-ui/react-popover": "^1.1.15",
+    "@radix-ui/react-select": "^2.2.6",
+    "@radix-ui/react-separator": "^1.1.8",
+    "@radix-ui/react-slot": "^1.2.4",
+    "@radix-ui/react-switch": "^1.2.6",
+    "@uiw/react-codemirror": "^4.25.7",
+    "@wireweave/core": "^2.6.0",
+    "@xyflow/react": "^12.10.1",
+    "class-variance-authority": "^0.7.1",
+    "clsx": "^2.1.1",
+    "lucide-react": "^0.577.0",
+    "marked": "^17.0.4",
+    "nunjucks": "^3.2.4",
+    "react": "18.2.0",
+    "react-dom": "18.2.0",
+    "react-zoom-pan-pinch": "^3.7.0",
+    "tailwind-merge": "^3.5.0",
+    "tailwindcss-animate": "^1.0.7"
+  },
+  "devDependencies": {
+    "@types/node": "^25.3.3",
+    "@types/react": "^18.0.0",
+    "@types/react-dom": "^18.0.0",
+    "@vitejs/plugin-react": "^5.1.4",
+    "autoprefixer": "^10.4.0",
+    "postcss": "^8.4.0",
+    "shadcn": "^4.0.0",
+    "tailwindcss": "^3.4.0",
+    "typescript": "^5.0.0",
+    "vite": "^7.3.1"
+  }
+}