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

backend/src/config.ts

@@ -2,6 +2,8 @@ export const config = {
   port: parseInt(process.env.PORT || '3001', 10),
   host: process.env.HOST || '0.0.0.0',
 
+  corsOrigin: process.env.CORS_ORIGIN || '*',
+
   trueApi: {
     baseUrl: process.env.TRUE_API_URL || 'https://markirovka.sandbox.crptech.ru/api/v3/true-api',
     publicCheckUrl: process.env.PUBLIC_CHECK_URL || 'https://mobile.api.crpt.ru/mobile/check',
@@ -10,5 +12,7 @@ export const config = {
     codesCheckPath: '/codes/check',
     batchSize: 1000,
     tokenTTL: 10 * 60 * 60 * 1000,
+    maxRetries: 3,
+    publicCheckConcurrency: 10,
   },
 }