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/providers/registry/kimchi.js

@@ -13,8 +13,8 @@ export default {
       signupUrl: "https://app.kimchi.dev",
     },
   },
-  category: "oauth",
-  authModes: ["oauth"],
+  category: "freeTier",
+  authModes: ["oauth", "apikey"],
   hasOAuth: true,
   transport: {
     baseUrl: "https://llm.kimchi.dev/openai/v1/chat/completions",