fix(ai): keep standard base64 data URIs for LM Studio integration

Removes the obsolete `normalizeLmStudioImageUrls` helper function which was incorrectly stripping the `data:image/jpeg;base64,` prefix from vision image URLs. Modern versions of LM Studio expect standard OpenAI-compatible Base64 Data URIs, and stripping this prefix results in an "Invalid url" error. Passing `processedMessages` directly allows LM Studio to correctly parse and process captured screenshots.

Co-authored-by: Oxygen-Low <95589118+Oxygen-Low@users.noreply.github.com>

Author: google-labs-jules[bot]

server/routes/ai.ts

@@ -33,37 +33,6 @@ const DEFAULT_HORDE_MODELS = [
   { provider: "horde", model_id: "Code" },
 ];
 
-/**
- * LM Studio's OpenAI-compatible endpoint currently accepts raw base64 in an
- * image_url block, rather than the data URI used by the OpenAI API. Keep the
- * data URI for every other provider and only remove its prefix for LM Studio.
- */
-const normalizeLmStudioImageUrls = (messages: any[]) =>
-  messages.map((message) => {
-    if (!Array.isArray(message.content)) return message;
-
-    return {
-      ...message,
-      content: message.content.map((part: any) => {
-        if (part?.type !== "image_url") return part;
-
-        const url = part.image_url?.url || part.image_url;
-        if (typeof url !== "string") return part;
-
-        const match = url.match(/^data:image\/[a-zA-Z0-9.+-]+;base64,(.+)$/);
-        if (!match) return part;
-
-        return {
-          ...part,
-          image_url: {
-            ...(typeof part.image_url === "object" ? part.image_url : {}),
-            url: match[1],
-          },
-        };
-      }),
-    };
-  });
-
 export const handleGetLocalProviders: RequestHandler = async (_req, res) => {
   const localModels = [...DEFAULT_HORDE_MODELS];
 
@@ -568,7 +537,7 @@ export const handleProxyAiRequest: RequestHandler = async (req, res) => {
             "http://127.0.0.1:1234/v1/chat/completions",
             {
               model,
-              messages: normalizeLmStudioImageUrls(processedMessages),
+              messages: processedMessages,
               stream,
             },
             axiosOptions,