feat: Initialize FastAPI AI Gateway project structure with authentication, module management, and LLM API routing.

app/main.py

@@ -0,0 +1,56 @@
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+from slowapi import _rate_limit_exceeded_handler
+from slowapi.errors import RateLimitExceeded
+
+from app.api.router import api_router
+from app.core.config import settings
+from app.core.limiter import limiter
+from app.core.database import engine, Base
+from app.models import module # Ensure models are loaded
+
+# Create tables
+Base.metadata.create_all(bind=engine)
+
+from fastapi.staticfiles import StaticFiles
+from app.api.endpoints import auth
+from app.api import admin_backend
+
+def create_application() -> FastAPI:
+    application = FastAPI(title=settings.PROJECT_NAME)
+    
+    # Mount Static Files
+    application.mount("/static", StaticFiles(directory="app/static"), name="static")
+
+    # Set up CORS
+    application.add_middleware(
+        CORSMiddleware,
+        allow_origins=["*"],
+        allow_credentials=True,
+        allow_methods=["*"],
+        allow_headers=["*"],
+    )
+    
+    # Set up Rate Limiter
+    application.state.limiter = limiter
+    application.add_exception_handler(RateLimitExceeded, _rate_limit_exceeded_handler)
+    
+    # Include routes
+    application.include_router(api_router, prefix="/api/v1")
+    application.include_router(auth.router, prefix="/auth", tags=["auth"])
+    application.include_router(admin_backend.router, prefix="/internal/admin", tags=["internal-admin"])
+    
+    return application
+
+app = create_application()
+
+from fastapi.responses import FileResponse
+import os
+
+@app.get("/admin")
+async def admin_panel():
+    return FileResponse("app/static/admin.html")
+
+@app.get("/")
+async def root():
+    return {"message": "Welcome to Storyline AI Gateway", "docs": "/docs"}