Refactor dev mode into a source repo script (remove dev subcommand from package).

passkey/fastapi/mainapp.py

@@ -43,15 +43,6 @@ async def lifespan(app: FastAPI):  # pragma: no cover - startup path
         # Re-raise to fail fast
         raise
 
-    # In dev mode, Vite serves assets directly; in production, mount static files
-    # This is deferred to lifespan because PASSKEY_DEVMODE is set after module import
-    if not frontend.is_dev_mode():
-        app.mount(
-            "/auth/assets/",
-            StaticFiles(directory=frontend.file("auth", "assets")),
-            name="assets",
-        )
-
     yield
     # (Optional) add shutdown cleanup here later
 
@@ -65,6 +56,14 @@ app.mount("/auth/api/admin/", admin.app)
 app.mount("/auth/api/", api.app)
 app.mount("/auth/ws/", ws.app)
 
+# In dev mode (PASSKEY_DEVMODE=1), Vite serves assets directly; skip static files mount
+if not frontend.is_dev_mode():
+    app.mount(
+        "/auth/assets/",
+        StaticFiles(directory=frontend.file("auth", "assets")),
+        name="assets",
+    )
+
 
 @app.get("/auth/restricted/")
 async def restricted_view():