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/cursor.js

@@ -23,7 +23,7 @@ export default {
       "Content-Type": "application/connect+proto",
       "User-Agent": "connect-es/1.6.1",
     },
-    clientVersion: "3.1.0",
+    clientVersion: "3.12.17",
   },
   models: [
     { id: "default", name: "Auto (Server Picks)" },
@@ -44,11 +44,11 @@ export default {
   oauth: {
     apiEndpoint: "https://api2.cursor.sh",
     chatEndpoint: "/aiserver.v1.ChatService/StreamUnifiedChatWithTools",
-    modelsEndpoint: "/aiserver.v1.AiService/GetDefaultModelNudgeData",
+    modelsEndpoint: "/agent.v1.AgentService/GetUsableModels",
     api3Endpoint: "https://api3.cursor.sh",
     agentEndpoint: "https://agent.api5.cursor.sh",
     agentNonPrivacyEndpoint: "https://agentn.api5.cursor.sh",
-    clientVersion: "3.1.0",
+    clientVersion: "3.12.17",
     clientType: "ide",
     dbKeys: {
       accessToken: "cursorAuth/accessToken",