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/utils/usageTracking.js

@@ -4,6 +4,9 @@
 
 import { FORMATS } from "../translator/formats.js";
 
+// Legacy per-chunk usage console line; off by default (superseded by "📊 done")
+const DEBUG_USAGE = process.env.LOG_USAGE_VERBOSE === "1";
+
 // ANSI color codes
 export const COLORS = {
   reset: "\x1b[0m",
@@ -400,6 +403,10 @@ export function estimateUsage(body, contentLength, targetFormat = FORMATS.OPENAI
 export function logUsage(provider, usage, model = null, connectionId = null, apiKey = null) {
   if (!usage || typeof usage !== "object") return;
 
+  // Console output moved to the unified "📊 done" line (streamingHandler). Kept as
+  // a no-op hook so callers stay unchanged; usage persistence happens via saveUsageStats.
+  if (!DEBUG_USAGE) return;
+
   const p = provider?.toUpperCase() || "UNKNOWN";
 
   // Support both formats: