add env-gated icon-reachability verifier; admin is_live; docs

app/main.py

@@ -6,10 +6,13 @@ from fastapi.staticfiles import StaticFiles
 
 from app import db
 from app.admin import create_admin
+from app.verify import Verifier
 
 BASE_DIR = Path(__file__).resolve().parent
 ICON_DIR = BASE_DIR / "static" / "icons"
 
+verifier = Verifier()
+
 app = FastAPI(title="IDRS API")
 app.mount("/static", StaticFiles(directory=str(BASE_DIR / "static")), name="static")
 
@@ -68,4 +71,5 @@ def get_public_icon(filename: str):
 
 @app.on_event("startup")
 def startup():
-    db.init_db()
+    db.init_db()
+    verifier.start()