Enable static file mounting and add sample images

src/backend/app/main.py

@@ -1,6 +1,8 @@
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
+from fastapi.staticfiles import StaticFiles
 from contextlib import asynccontextmanager
+from pathlib import Path
 import backend.app.core
 from backend.app.core.logging_config import setup_logging
 from backend.app.core import database
@@ -27,12 +29,22 @@ async def lifespan(_app: FastAPI):
 
 app.add_middleware(
     CORSMiddleware, # type: ignore
-    allow_origins=origins,
+    allow_origin_regex=r"^http://localhost(:[0-9]+)?$",
     allow_credentials=True,
     allow_methods=["*"],
     allow_headers=["*"],
 )
 
+# mount static files directory
+current_file = Path(__file__).resolve()
+root_dir = current_file.parent.parent.parent
+static_dir = root_dir / "static"
+if static_dir.exists() and static_dir.is_dir():
+    app.mount("/static", StaticFiles(directory=static_dir), name="static")
+old_frontend_src_assets = root_dir / "frontend" / "src" / "assets"
+if old_frontend_src_assets.exists() and old_frontend_src_assets.is_dir():
+    app.mount("/src/assets", StaticFiles(directory=old_frontend_src_assets), name="src_assets")
+
 
 @app.get("/")
 def read_root():