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)

open-sse/utils/cursorChecksum.js

@@ -128,7 +128,8 @@ export function buildCursorHeaders(accessToken, machineId = null, ghostMode = tr
     "x-amzn-trace-id": `Root=${crypto.randomUUID()}`,
     "x-client-key": clientKey,
     "x-cursor-checksum": checksum,
-    "x-cursor-client-version": "3.1.0",
+    "x-cursor-client-version": "3.12.17",
+    "x-cursor-client-commit": "0fb762053c34788bb7760d5673f8a6d4c8589d50",
     "x-cursor-client-type": "ide",
     "x-cursor-client-os": os,
     "x-cursor-client-arch": arch,