feat(api): implement chestny-znak web app with True API integration

- Fastify backend with auth (CryptoPro CAdES-BES), KM check, UPD parsing
- React frontend with auth page, code check, XML upload, results table
- Client-side signing via crypto-pro 2.3.0 (browser plugin)
- Token caching with auto-refresh, retry with exponential backoff
- Input validation schemas, file size limits, global 401 interceptor
- Docker compose with backend + frontend (nginx) services

frontend/package-lock.json

@@ -8,6 +8,7 @@
       "name": "chestny-znak-api-frontend",
       "version": "1.0.0",
       "dependencies": {
+        "crypto-pro": "^2.3.0",
         "react": "^19.0.0",
         "react-dom": "^19.0.0"
       },
@@ -1725,6 +1726,12 @@
         "node": ">= 8"
       }
     },
+    "node_modules/crypto-pro": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/crypto-pro/-/crypto-pro-2.3.0.tgz",
+      "integrity": "sha512-cppYuMRRijEaZ0UKAOW5L1CQIvzQA3DTRp4pARINl6K8Pp1JMhlch5TyWwv6Z4Y3x677A9xxcW62okHD91Veqg==",
+      "license": "MIT"
+    },
     "node_modules/csstype": {
       "version": "3.2.3",
       "resolved": "https://registry.npmjs.org/csstype/-/csstype-3.2.3.tgz",