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/api-airforce.js

@@ -0,0 +1,36 @@
+export default {
+  id: "api-airforce",
+  alias: "af",
+  aliases: [
+    "airforce",
+  ],
+  uiAlias: "af",
+  display: {
+    name: "API.airforce",
+    icon: "flight",
+    color: "#0EA5E9",
+    textIcon: "AF",
+    website: "https://api.airforce",
+    notice: {
+      apiKeyUrl: "https://api.airforce",
+    },
+  },
+  category: "freeTier",
+  authType: "apikey",
+  authModes: [
+    "apikey",
+  ],
+  transport: {
+    baseUrl: "https://api.airforce/v1/chat/completions",
+    validateUrl: "https://api.airforce/v1/models",
+    headers: {
+      "HTTP-Referer": "https://endpoint-proxy.local",
+      "X-Title": "Endpoint Proxy",
+    },
+  },
+  models: [
+    { id: "anthropic/claude-3.7-sonnet", name: "Claude 3.7 Sonnet (Free)", contextLength: 200000 },
+    { id: "moonshot/kimi-k2.6", name: "Kimi K2.6 (Free)", contextLength: 262144 },
+    { id: "google/gemini-2.5-flash", name: "Gemini 2.5 Flash (Free)", contextLength: 1048576 },
+  ],
+};