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/kiro-nonstream-error.test.js

@@ -0,0 +1,64 @@
+import { describe, expect, it, vi } from "vitest";
+
+vi.mock("@/lib/usageDb.js", () => ({
+  appendRequestLog: vi.fn(async () => {}),
+  saveRequestDetail: vi.fn(async () => {}),
+  saveRequestUsage: vi.fn(async () => {})
+}));
+
+const { FORMATS } = await import("../../open-sse/translator/formats.js");
+const {
+  handleForcedSSEToJson,
+  parseSSEToOpenAIResponse
+} = await import("../../open-sse/handlers/chatCore/sseToJsonHandler.js");
+
+describe("Kiro non-streaming error propagation", () => {
+  it("prefers a terminal SSE error over earlier semantic chunks", () => {
+    const raw = [
+      'data: {"choices":[{"delta":{"content":"partial"},"finish_reason":null}]}',
+      'data: {"error":{"message":"Kiro transport failed","code":"kiro_missing_terminal"}}',
+      "data: [DONE]"
+    ].join("\n\n");
+
+    expect(parseSSEToOpenAIResponse(raw, "kiro")).toEqual({
+      error: {
+        message: "Kiro transport failed",
+        code: "kiro_missing_terminal"
+      }
+    });
+  });
+
+  it("returns 502 instead of collapsing a failed Kiro SSE stream into stop", async () => {
+    const encoder = new TextEncoder();
+    const raw = [
+      'data: {"choices":[{"delta":{"content":"partial"},"finish_reason":null}]}',
+      'data: {"error":{"message":"Kiro stream ended incompletely","code":"kiro_missing_terminal"}}',
+      "data: [DONE]",
+      ""
+    ].join("\n\n");
+    const result = await handleForcedSSEToJson({
+      providerResponse: new Response(new ReadableStream({
+        start(controller) {
+          controller.enqueue(encoder.encode(raw));
+          controller.close();
+        }
+      }), { headers: { "content-type": "text/event-stream" } }),
+      sourceFormat: FORMATS.OPENAI,
+      provider: "kiro",
+      model: "kr/claude-opus-4.8",
+      body: { model: "kr/claude-opus-4.8", messages: [] },
+      stream: false,
+      requestStartTime: Date.now(),
+      connectionId: "test-connection",
+      clientRawRequest: { endpoint: "/v1/chat/completions" },
+      trackDone: vi.fn(),
+      appendLog: vi.fn()
+    });
+    const json = await result.response.json();
+
+    expect(result.success).toBe(false);
+    expect(result.response.status).toBe(502);
+    expect(json.error.message).toContain("Kiro stream ended incompletely");
+    expect(json).not.toHaveProperty("choices");
+  });
+});