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/morph.js

@@ -0,0 +1,29 @@
+export default {
+  id: "morph",
+  alias: "morph",
+  aliases: ["morphllm"],
+  uiAlias: "morph",
+  display: {
+    name: "Morph",
+    icon: "change_history",
+    color: "#14B8A6",
+    textIcon: "MP",
+    website: "https://morphllm.com",
+    notice: { apiKeyUrl: "https://morphllm.com" },
+  },
+  category: "apikey",
+  authType: "apikey",
+  authModes: ["apikey"],
+  transport: {
+    baseUrl: "https://api.morphllm.com/v1/chat/completions",
+    validateUrl: "https://api.morphllm.com/v1/models",
+  },
+  models: [
+    { id: "morph-v3-large", name: "Morph v3 Large" },
+    { id: "morph-v3-fast", name: "Morph v3 Fast" },
+    { id: "morph-qwen35-397b", name: "Qwen 3.5 397B (Morph)", contextLength: 262144 },
+    { id: "morph-minimax27-230b", name: "MiniMax M2.7 (Morph)", contextLength: 200704 },
+    { id: "morph-qwen36-27b", name: "Qwen 3.6 27B (Morph)", contextLength: 262144 },
+    { id: "morph-dsv4flash", name: "DeepSeek V4 Flash (Morph)", contextLength: 1048576 },
+  ],
+};