feat: add LiteLLM as AI gateway provider

Author: RheagalFire

apps/sim/components/icons.tsx

@@ -4335,6 +4335,19 @@ export function VllmIcon(props: SVGProps<SVGSVGElement>) {
   )
 }
 
+export function LitellmIcon(props: SVGProps<SVGSVGElement>) {
+  return (
+    <svg {...props} fill='none' viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'>
+      <title>LiteLLM</title>
+      <rect width='24' height='24' rx='4' fill='#1A56DB' />
+      <path
+        d='M6 7h2v10H6V7zm4 0h2v8h4v2h-6V7z'
+        fill='white'
+      />
+    </svg>
+  )
+}
+
 export function PosthogIcon(props: SVGProps<SVGSVGElement>) {
   return (
     <svg

apps/sim/lib/core/config/env.ts

@@ -121,6 +121,8 @@ export const env = createEnv({
     OLLAMA_URL:                            z.string().url().optional(),            // Ollama local LLM server URL
     VLLM_BASE_URL:                         z.string().url().optional(),            // vLLM self-hosted base URL (OpenAI-compatible)
     VLLM_API_KEY:                          z.string().optional(),                  // Optional bearer token for vLLM
+    LITELLM_BASE_URL:                      z.string().url().optional(),            // LiteLLM proxy base URL (OpenAI-compatible)
+    LITELLM_API_KEY:                       z.string().optional(),                  // Optional bearer token for LiteLLM
     FIREWORKS_API_KEY:                     z.string().optional(),                  // Optional Fireworks AI API key for model listing
     COHERE_API_KEY:                        z.string().min(1).optional(),           // Cohere API key for reranker (rerank-v4.0-pro, rerank-v4.0-fast, rerank-v3.5)
     COHERE_API_KEY_1:                      z.string().min(1).optional(),           // Primary Cohere API key for rotation