feat: xAI image generate/edit, API key import, and per-provider timeouts

- Add dedicated xAI image adapter with generate + edit (multi-image) via
  /v1/images/generations and /v1/images/edits, plus aspect_ratio/resolution UI
- Support importing existing API keys and exposing connection api-key routes
- Add global/per-provider connect timeout overrides from settings
- Keep unrelated provider UX improvements on this branch; no Grok quota tracking

open-sse/providers/registry/xai.js

@@ -31,10 +31,27 @@ export default {
     { id: "grok-4-fast-reasoning", name: "Grok 4 Fast Reasoning" },
     { id: "grok-code-fast-1", name: "Grok Code Fast" },
     { id: "grok-3", name: "Grok 3" },
-    { id: "grok-2-image-1212", name: "Grok 2 Image", params: ["n","response_format"], kind: "image" },
+    {
+      id: "grok-imagine-image-quality",
+      name: "Grok Imagine Image Quality",
+      capabilities: ["text2img", "edit"],
+      params: ["n", "aspect_ratio", "resolution", "response_format", "size"],
+      kind: "image",
+    },
+    {
+      id: "grok-2-image-1212",
+      name: "Grok 2 Image",
+      capabilities: ["text2img", "edit"],
+      params: ["n", "aspect_ratio", "resolution", "response_format", "size"],
+      kind: "image",
+    },
   ],
   serviceKinds: ["llm","imageToText","webSearch","image"],
-  imageConfig: { baseUrl: "https://api.x.ai/v1/images/generations", bodyFields: ["model","prompt","n","response_format"] },
+  imageConfig: {
+    baseUrl: "https://api.x.ai/v1/images/generations",
+    editsUrl: "https://api.x.ai/v1/images/edits",
+    bodyFields: ["model", "prompt", "n", "response_format", "aspect_ratio", "resolution", "image", "images"],
+  },
   searchViaChat: {
     defaultModel: "grok-4.20-reasoning",
     endpoint: "https://api.x.ai/v1/responses",