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/selfhosted-stt.js

@@ -0,0 +1,48 @@
+// Self-hosted, OpenAI-compatible speech-to-text (whisper.cpp, faster-whisper,
+// Speaches, vLLM-served Whisper, ...).
+//
+// Every other STT provider here is a named cloud service with a fixed endpoint.
+// This one exists so a locally-served /v1/audio/transcriptions can be used at
+// all: set the connection's providerSpecificData.baseUrl to the full URL of the
+// endpoint, exactly as the custom embedding providers already work.
+//
+// sttCore dispatches on `format`; anything that is not one of the five named
+// cloud shapes falls through to transcribeOpenAICompatible, which POSTs the
+// standard multipart body (file, model, and optional language / prompt /
+// response_format / temperature). That is precisely what whisper.cpp's OpenAI
+// endpoint accepts.
+//
+// authType is "apikey" rather than "none" so the connection carries a
+// credentials record — which is where providerSpecificData.baseUrl lives. Local
+// servers ignore the key itself; any non-empty value works.
+export default {
+  id: "selfhosted-stt",
+  priority: 50,
+  hasFree: true,
+  alias: "selfhosted-stt",
+  display: {
+    name: "Self-hosted STT",
+    icon: "cloud",
+    color: "#ffffffff",
+    textIcon: "ST",
+    website: "https://github.com/ggml-org/whisper.cpp",
+  },
+  category: "apikey",
+  auth: {
+    apiKey: {
+      text: "Set providerSpecificData.baseUrl to the full transcriptions URL, e.g. http://host:8080/v1/audio/transcriptions. The API key is not checked by local servers; any value works.",
+    },
+  },
+  models: [
+    { id: "whisper-1", name: "Whisper (self-hosted)", params: ["language", "response_format", "temperature", "prompt"], kind: "stt" },
+  ],
+  serviceKinds: ["stt"],
+  sttConfig: {
+    // Overridden per connection by providerSpecificData.baseUrl; this default
+    // only makes the provider usable out of the box on a same-host deployment.
+    baseUrl: "http://localhost:8080/v1/audio/transcriptions",
+    authType: "apikey",
+    authHeader: "bearer",
+    format: "openai",
+  },
+};