feat: Add support for multiple AI providers (bytez, llm7.io, aimlapi.com, routeway.ai, g4f.dev) and fix Chutes loader

- Add custom loaders for bytez, llm7, aimlapi, routeway, and g4f providers
- Add provider definitions to models-api.json with sample models
- Add provider icon names to types.ts
- Chutes loader already exists and should work with CHUTES_API_KEY env var

Providers added:
- bytez: Uses BYTEZ_API_KEY, OpenAI-compatible
- llm7: Uses LLM7_API_KEY (optional), OpenAI-compatible
- aimlapi: Uses AIMLAPI_API_KEY, OpenAI-compatible
- routeway: Uses ROUTEWAY_API_KEY, OpenAI-compatible
- g4f: Uses G4F_API_KEY (optional), free tier available

opencode/packages/ui/src/components/provider-icons/types.ts

@@ -66,6 +66,11 @@ export const iconNames = [
   "cloudflare-ai-gateway",
   "chutes",
   "cerebras",
+  "bytez",
+  "llm7",
+  "aimlapi",
+  "routeway",
+  "g4f",
   "baseten",
   "bailing",
   "azure",