Claude Code: Add StaticFiles mount and frontend index.html

- Import StaticFiles from fastapi.staticfiles
- Mount /frontend to serve pixel art, fonts, HTML
- Create frontend/index.html as main entry page with links

app.py

@@ -17,7 +17,8 @@ print(">>> CAIN: PORT =", os.environ.get('PORT', '7860'), flush=True)
 # CRITICAL: Create FastAPI app at TOP LEVEL, outside any try/except
 # This ensures the server ALWAYS starts, even if brain is broken
 from fastapi import FastAPI, Request
-from fastapi.responses import JSONResponse
+from fastapi.responses import JSONResponse, FileResponse
+from fastapi.staticfiles import StaticFiles
 from contextlib import asynccontextmanager
 
 print(">>> CAIN: Creating FastAPI app...", flush=True)
@@ -33,6 +34,9 @@ async def lifespan(app: FastAPI):
 
 app = FastAPI(title="HuggingClaw - Cain", version="0.0.1", lifespan=lifespan)
 
+# Mount frontend folder for static assets (pixel art, fonts, HTML)
+app.mount("/frontend", StaticFiles(directory="frontend"), name="frontend")
+
 @app.get("/")
 async def root():
     """Root endpoint - simple alive status."""