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/llm7.js

@@ -0,0 +1,35 @@
+export default {
+  id: "llm7",
+  alias: "llm7",
+  aliases: [
+    "llm-7",
+  ],
+  uiAlias: "llm7",
+  display: {
+    name: "LLM7",
+    icon: "pool",
+    color: "#7C3AED",
+    textIcon: "L7",
+    website: "https://llm7.io",
+    notice: {
+      apiKeyUrl: "https://llm7.io",
+    },
+  },
+  category: "apikey",
+  authType: "apikey",
+  authModes: [
+    "apikey",
+  ],
+  transport: {
+    baseUrl: "https://api.llm7.io/v1/chat/completions",
+    validateUrl: "https://api.llm7.io/v1/models",
+  },
+  models: [
+    { id: "gpt-5.5", name: "GPT-5.5 (LLM7)", contextLength: 1050000 },
+    { id: "claude-opus-5", name: "Claude Opus 5 (LLM7)", contextLength: 1000000 },
+    { id: "deepseek-v4-flash", name: "DeepSeek V4 Flash (LLM7)", contextLength: 1000000 },
+    { id: "grok-4.5", name: "Grok 4.5 (LLM7)", contextLength: 500000 },
+    { id: "kimi-k3", name: "Kimi K3 (LLM7)", contextLength: 1000000 },
+  ],
+  passthroughModels: true,
+};