Resolves merge conflicts:
- install.sh, build.sh, .github/workflows/build.yml: Reverted to Dushnilin's versions to avoid installing SourceForge mirrors.
- fe-app-tachyon: Resolved type, formatting and copyOutbound conflicts, keeping both Dushnilin's custom features and ushan0v's frontend performance optimizations.
- backend: Kept Dushnilin's ucode refactorings, Telegram bot integration, and release repository URL (Dushnilin/tachyon) while merging updates.uc cache format v8 & persistent cache format v7.
- tests: Merged tests from both branches, preserving ucode -L wrappers for local test execution.
Replace the legacy shell-owned runtime with modular ucode implementations for configuration, service lifecycle, subscriptions, diagnostics, DNS, nftables, routing, providers, updates, and sing-box generation.
Keep thin OpenWrt entrypoints and add regression and package-contract coverage for the new runtime ownership model.
Dushnilin