feat(frontend): Install DMS libraries for client-side processing

Added libraries:
- tesseract.js: Client-side OCR (rus+eng)
- pdf-lib: PDF operations (split, merge, rotate)
- mammoth: DOCX text extraction
- fuse.js: Client-side fuzzy search
- reactflow: Workflow visualization
- recharts: Dashboard charts
- react-signature-canvas: Digital signatures
- @dnd-kit: Advanced drag & drop

Phase 2: Frontend Foundation started

frontend/package.json

@@ -12,10 +12,15 @@
   "dependencies": {
     "@chatscope/chat-ui-kit-react": "^2.1.1",
     "@chatscope/chat-ui-kit-styles": "^1.4.0",
+    "@dnd-kit/core": "^6.3.1",
+    "@dnd-kit/sortable": "^10.0.0",
     "@tanstack/react-table": "^8.21.3",
     "date-fns": "^4.1.0",
+    "fuse.js": "^7.1.0",
     "lucide-react": "^0.574.0",
+    "mammoth": "^1.11.0",
     "next": "16.1.6",
+    "pdf-lib": "^1.17.1",
     "pdfjs-dist": "^5.4.624",
     "react": "19.2.3",
     "react-big-calendar": "^1.19.4",
@@ -23,7 +28,11 @@
     "react-dropzone": "^15.0.0",
     "react-file-icon": "^1.6.0",
     "react-pdf": "^10.4.1",
-    "sonner": "^2.0.7"
+    "react-signature-canvas": "^1.1.0-alpha.2",
+    "reactflow": "^11.11.4",
+    "recharts": "^3.7.0",
+    "sonner": "^2.0.7",
+    "tesseract.js": "^7.0.0"
   },
   "devDependencies": {
     "@tailwindcss/postcss": "^4",