feat: add LiteLLM provider and Code-Inc image target

lib/llm/litellm.mjs

@@ -0,0 +1,32 @@
+// LiteLLM proxy provider using the OpenAI-compatible chat completions API.
+
+import { OpenAICompatibleProvider } from './openai-compatible.mjs';
+
+export class LiteLLMProvider extends OpenAICompatibleProvider {
+  constructor(config = {}) {
+    const baseUrl = config.baseUrl?.replace(/\/+$/, '') || null;
+    const model = config.model || null;
+
+    super({
+      ...config,
+      name: 'litellm',
+      baseUrl: baseUrl || 'http://localhost:4000/v1',
+      model: model || 'unconfigured',
+      requiresApiKey: true,
+    });
+
+    this.baseUrl = baseUrl;
+    this.model = model;
+  }
+
+  get isConfigured() {
+    return Boolean(this.baseUrl && this.apiKey && this.model);
+  }
+
+  get status() {
+    if (!this.baseUrl) return { state: 'misconfigured', reason: 'LLM_BASE_URL is required for LiteLLM' };
+    if (!this.apiKey) return { state: 'misconfigured', reason: 'LLM_API_KEY is required for LiteLLM' };
+    if (!this.model) return { state: 'misconfigured', reason: 'LLM_MODEL is required for LiteLLM' };
+    return { state: 'configured', provider: this.name, model: this.model, baseUrl: this.baseUrl };
+  }
+}