fix(settings): default new model services to gpt-5.6-luna

Use gpt-5.6-luna as the suggested model ID for OpenAI-compatible services.

apps/web/src/components/settings/ai-provider-options.ts

@@ -2,7 +2,7 @@ import type { AiProvider } from "@edgeever/shared";
 import { ApiRequestError } from "@/lib/api";
 
 export const providerDefaults: Record<AiProvider, { displayName: string; baseUrl: string; modelId: string }> = {
-  "openai-compatible": { displayName: "OpenAI-compatible", baseUrl: "https://api.openai.com/v1", modelId: "gpt-4.1-mini" },
+  "openai-compatible": { displayName: "OpenAI-compatible", baseUrl: "https://api.openai.com/v1", modelId: "gpt-5.6-luna" },
   anthropic: { displayName: "Anthropic", baseUrl: "https://api.anthropic.com/v1", modelId: "claude-sonnet-4-5" },
   google: { displayName: "Google Gemini", baseUrl: "https://generativelanguage.googleapis.com/v1beta", modelId: "gemini-2.5-flash" },
 };