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/capabilities-opus-context.test.js

@@ -3,7 +3,7 @@ import { describe, expect, it } from "vitest";
 import { getCapabilitiesForModel } from "../../open-sse/providers/capabilities.js";
 
 // Claude Opus 4.6+ ships a 1M-token context window (GA, standard pricing).
-// The registry exposes dashed ids (claude-opus-4-8, claude-opus-4-7), which
+// The registry exposes dashed ids (claude-opus-5, claude-opus-4-8, claude-opus-4-7), which
 // must resolve to the 1M context + adaptive thinking caps rather than falling
 // through to the generic *claude*opus* pattern (200k / budget thinking).
 describe("Claude Opus 1M context capabilities", () => {
@@ -17,6 +17,10 @@ describe("Claude Opus 1M context capabilities", () => {
   };
 
   for (const model of [
+    "claude-opus-5",
+    "claude-opus-5-thinking",
+    "claude-opus-5-agentic",
+    "claude-opus-5-thinking-agentic",
     "claude-opus-4-8",
     "claude-opus-4.8",
     "claude-opus-4-7",