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/__snapshots__/golden-request.test.js.snap

@@ -118,6 +118,9 @@ exports[`GOLDEN request: OpenAI → Claude > reasoning_effort → adaptive outpu
       "type": "text",
     },
   ],
+  "thinking": {
+    "type": "adaptive",
+  },
 }
 `;