Merge remote-tracking branch 'origin/master' into gitea/feature/end

Resolved conflicts taking origin/master (v0.5.55) as canonical, with local
features re-applied:
- runtime log level (LOG_LEVEL env + dashboard Settings → Logging, applied
  immediately and persisted across restarts)
- free/noAuth provider enable/disable toggle via providerStrategies.enabled
- parallel model testing (Test All Models / Test Selected Keys)

tests/translator/golden-url-header.test.js

@@ -18,7 +18,7 @@ const SPECIAL_CRED = {
 // Chúng được lock riêng ở 11-provider edge tests / unit test chuyên biệt.
 const SPECIALIZED = new Set([
   "antigravity", "azure", "gemini-cli", "github", "iflow", "qoder", "kiro",
-  "codex", "cursor", "vertex", "vertex-partner", "qwen", "opencode",
+  "codex", "cursor", "vertex", "vertex-partner", "opencode",
   "opencode-go", "grok-web", "perplexity-web", "ollama-local", "commandcode",
   "xiaomi-tokenplan", "mimo-free",
 ]);