Enhance image and embedding provider support

- Added new image models for GPT 5.2, 5.3, and 5.4, including capabilities for text-to-image and editing.
- Updated embedding handling to include optional dimensions in requests.
- Introduced support for custom embedding providers, allowing dynamic fetching and validation of custom nodes.
- Improved image generation handling with Codex integration, including progress tracking and error handling.
- Enhanced UI components to support adding custom embeddings and displaying their status.

src/app/api/providers/route.js

@@ -7,7 +7,7 @@ import {
   getProxyPoolById,
 } from "@/models";
 import { APIKEY_PROVIDERS } from "@/shared/constants/config";
-import { FREE_TIER_PROVIDERS, WEB_COOKIE_PROVIDERS, isOpenAICompatibleProvider, isAnthropicCompatibleProvider } from "@/shared/constants/providers";
+import { FREE_TIER_PROVIDERS, WEB_COOKIE_PROVIDERS, isOpenAICompatibleProvider, isAnthropicCompatibleProvider, isCustomEmbeddingProvider } from "@/shared/constants/providers";
 
 export const dynamic = "force-dynamic";
 
@@ -104,7 +104,8 @@ export async function POST(request) {
       FREE_TIER_PROVIDERS[provider] ||
       isWebCookieProvider ||
       isOpenAICompatibleProvider(provider) ||
-      isAnthropicCompatibleProvider(provider);
+      isAnthropicCompatibleProvider(provider) ||
+      isCustomEmbeddingProvider(provider);
 
     if (!provider || !isValidProvider) {
       return NextResponse.json({ error: "Invalid provider" }, { status: 400 });
@@ -146,6 +147,22 @@ export async function POST(request) {
         return NextResponse.json({ error: "Only one connection is allowed for this Anthropic Compatible node" }, { status: 400 });
       }
 
+      providerSpecificData = {
+        prefix: node.prefix,
+        baseUrl: node.baseUrl,
+        nodeName: node.name,
+      };
+    } else if (isCustomEmbeddingProvider(provider)) {
+      const node = await getProviderNodeById(provider);
+      if (!node) {
+        return NextResponse.json({ error: "Custom Embedding node not found" }, { status: 404 });
+      }
+
+      const existingConnections = await getProviderConnections({ provider });
+      if (existingConnections.length > 0) {
+        return NextResponse.json({ error: "Only one connection is allowed for this Custom Embedding node" }, { status: 400 });
+      }
+
       providerSpecificData = {
         prefix: node.prefix,
         baseUrl: node.baseUrl,