feat: integrate PDF Tools with toolbox portal

public/toolbox-app.json

@@ -0,0 +1,39 @@
+{
+  "$schema": "https://git.add-ideas.de/zemion/toolbox-sdk/raw/branch/main/schemas/toolbox-app.v1.schema.json",
+  "schemaVersion": 1,
+  "id": "de.add-ideas.pdf-tools",
+  "name": "PDF Workbench",
+  "description": "Page-level PDF operations performed locally in the browser.",
+  "entry": "./",
+  "icon": "./favicon.svg",
+  "categories": ["documents", "pdf"],
+  "tags": ["merge", "split", "rotate", "reorder"],
+  "actions": [
+    {
+      "id": "source",
+      "label": "Source",
+      "url": "https://git.add-ideas.de/zemion/pdf-tools/src/tag/v0.3.4"
+    }
+  ],
+  "integration": {
+    "contextVersion": 1,
+    "launchModes": ["navigate", "new-tab"],
+    "embedding": "unsupported"
+  },
+  "requirements": {
+    "secureContext": true,
+    "workers": true,
+    "indexedDb": true,
+    "crossOriginIsolated": false
+  },
+  "privacy": {
+    "processing": "local",
+    "fileUploads": false,
+    "telemetry": false
+  },
+  "source": {
+    "repository": "https://git.add-ideas.de/zemion/pdf-tools",
+    "license": "AGPL-3.0-only"
+  },
+  "version": "0.3.4"
+}