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/handlers/embeddingProviders/selfhostedEmbedding.js

@@ -0,0 +1,46 @@
+// Self-hosted embeddings — like openaiCompatNode, but the baseUrl is REQUIRED.
+//
+// openaiCompatNode falls back to https://api.openai.com/v1 when a connection
+// carries no providerSpecificData.baseUrl. For a custom NODE that default is
+// defensible: the node was created by pointing at some OpenAI-compatible URL, and
+// OpenAI is the archetype. For a provider whose entire purpose is "my own
+// server", it is actively harmful — a connection saved without a baseUrl sends
+// the INPUT TEXT and the API KEY to OpenAI, silently, under a provider named
+// "Self-hosted Embedding".
+//
+// Observed exactly that with a placeholder connection (2026-08-04):
+//
+//   [selfhosted-embedding/embedding] [401]: Incorrect API key provided: abc.
+//   You can find your API key at https://platform.openai.com/account/api-keys.
+//
+// The key "abc" was typed as a throwaway for a LOCAL server and left the network.
+// A self-hosted provider must never have a cloud fallback, so this one refuses
+// instead: no baseUrl means a configuration error, reported as such.
+import createOpenAIEmbeddingAdapter from "./openai.js";
+
+const baseAdapter = createOpenAIEmbeddingAdapter("openai");
+
+export class MissingBaseUrlError extends Error {
+  constructor() {
+    super(
+      "Self-hosted Embedding needs an endpoint: set this connection's baseUrl to " +
+        "the OpenAI base URL of your server, e.g. http://host:8080/v1 (note the /v1 — " +
+        "\"/embeddings\" is appended to it). Refusing to fall back to api.openai.com, " +
+        "which would send your input and API key to OpenAI."
+    );
+    this.name = "MissingBaseUrlError";
+    this.isConfigError = true;
+  }
+}
+
+export default {
+  ...baseAdapter,
+  buildUrl: (_model, creds) => {
+    const rawBaseUrl = creds?.providerSpecificData?.baseUrl;
+    if (!rawBaseUrl || !String(rawBaseUrl).trim()) throw new MissingBaseUrlError();
+    // Accept either the OpenAI base or a full embeddings URL, so a value pasted
+    // from a curl example works as well as one typed from the help text.
+    const baseUrl = String(rawBaseUrl).trim().replace(/\/$/, "").replace(/\/embeddings$/, "");
+    return `${baseUrl}/embeddings`;
+  },
+};