Merge branch 'temp-upstream-rebrand' into main

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.

tests/urltest_interrupt.sh

@@ -256,5 +256,4 @@ if (!contains(selector.outbounds, "proxy-2-out"))
 if (!contains(selector.outbounds, "proxy-urltest-cfg020001-out"))
     die("URLTest outbound should remain in selector\n");
 ' "$hide_added_output" || fail "URLTest hide added selector regression"
-
 printf 'URLTest interrupt checks passed\n'