Crack: bypass license check - force all limits unlimited

- Vendor shuffle-shared v1.2.51 as backend/go-app/shuffle-shared
- Add replace directive in go.mod to use the local moduled copy
- In HandleCheckLicense, force org.Licensed=true and set every
  SyncFeatures limit to 1e9, skipping all license-key logic
- Update Dockerfile to ADD the local shuffle-shared before go build
- Verified: backend image builds successfully via docker

.gitignore

@@ -30,3 +30,4 @@ shuffle-database/performance_analyzer_enabled.conf
 shuffle-database/rca_enabled.conf
 
 #*/package-lock.json
+.omo/