feat: add toolbox contract shell and testkit

examples/react-app/public/icon.svg

@@ -0,0 +1,4 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64" role="img" aria-label="Example Tool">
+  <rect width="64" height="64" rx="14" fill="#3156d3" />
+  <path d="M18 20h28v7H18zm0 12h28v7H18zm0 12h18v7H18z" fill="#fff" />
+</svg>

examples/react-app/public/toolbox-app.json

@@ -0,0 +1,32 @@
+{
+  "$schema": "https://git.add-ideas.de/zemion/toolbox-sdk/raw/branch/main/schemas/toolbox-app.v1.schema.json",
+  "schemaVersion": 1,
+  "id": "de.add-ideas.example-tool",
+  "name": "Example Tool",
+  "version": "0.1.0",
+  "description": "A minimal toolbox-compatible React application.",
+  "entry": "./",
+  "icon": "./icon.svg",
+  "categories": ["examples"],
+  "tags": ["react", "toolbox"],
+  "integration": {
+    "contextVersion": 1,
+    "launchModes": ["navigate", "new-tab"],
+    "embedding": "unsupported"
+  },
+  "requirements": {
+    "secureContext": false,
+    "workers": false,
+    "indexedDb": false,
+    "crossOriginIsolated": false
+  },
+  "privacy": {
+    "processing": "local",
+    "fileUploads": false,
+    "telemetry": false
+  },
+  "source": {
+    "repository": "https://git.add-ideas.de/zemion/toolbox-sdk",
+    "license": "Apache-2.0"
+  }
+}

examples/react-app/public/toolbox.catalog.json

@@ -0,0 +1,23 @@
+{
+  "$schema": "https://git.add-ideas.de/zemion/toolbox-sdk/raw/branch/main/schemas/toolbox-catalog.v1.schema.json",
+  "schemaVersion": 1,
+  "id": "de.add-ideas.example-toolbox",
+  "name": "Example Toolbox",
+  "home": "./",
+  "theme": {
+    "mode": "system",
+    "brand": "Example Toolbox"
+  },
+  "apps": [
+    {
+      "manifest": "./toolbox-app.json",
+      "enabled": true
+    },
+    {
+      "name": "ADD Ideas",
+      "entry": "https://add-ideas.de/",
+      "launch": "new-tab",
+      "enabled": true
+    }
+  ]
+}