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/unit/thinking-levels-kiro.test.js

@@ -0,0 +1,14 @@
+import { describe, it, expect } from "vitest";
+import { getThinkingLevels } from "../../open-sse/providers/thinkingLevels.js";
+
+describe("getThinkingLevels for Kiro", () => {
+  it("does not advertise native intensity for legacy Kiro models", () => {
+    expect(getThinkingLevels("kiro", "claude-sonnet-4.5")).toBeNull();
+    expect(getThinkingLevels("kiro", "glm-5")).toBeNull();
+  });
+
+  it("advertises native levels for supported Kiro models", () => {
+    expect(getThinkingLevels("kiro", "claude-sonnet-5")).toContain("high");
+    expect(getThinkingLevels("kiro", "gpt-5.6-sol")).toContain("xhigh");
+  });
+});