Re-use webui fastapi application rather than requiring one or the other, not both.

modules/api/api.py

@@ -2,15 +2,13 @@ from modules.api.processing import StableDiffusionProcessingAPI
 from modules.processing import StableDiffusionProcessingTxt2Img, process_images
 import modules.shared as shared
 import uvicorn
-from fastapi import FastAPI, Body, APIRouter
+from fastapi import Body, APIRouter
 from fastapi.responses import JSONResponse
 from pydantic import BaseModel, Field, Json
 import json
 import io
 import base64
 
-app = FastAPI()
-
 class TextToImageResponse(BaseModel):
     images: list[str] = Field(default=None, title="Image", description="The generated image in base64 format.")
     parameters: Json
@@ -18,7 +16,7 @@ class TextToImageResponse(BaseModel):
 
 
 class Api:
-    def __init__(self):
+    def __init__(self, app):
         self.router = APIRouter()
         app.add_api_route("/v1/txt2img", self.text2imgapi, methods=["POST"])