feat: customize site banners and login notices

backend/app/routers/site.py

@@ -5,6 +5,7 @@ from fastapi import APIRouter, Depends
 
 from ..auth import get_current_user
 from ..build_info import BUILD_NUMBER, CHANGELOG
+from ..config import normalize_banner_color
 from ..runtime import get_runtime_settings
 
 router = APIRouter(prefix="/site", tags=["site"])
@@ -15,6 +16,7 @@ _BANNER_TONES = {"info", "warning", "error", "maintenance"}
 def _build_site_info(include_changelog: bool) -> Dict[str, Any]:
     runtime = get_runtime_settings()
     banner_message = (runtime.site_banner_message or "").strip()
+    login_message = (runtime.site_login_message or "").strip()
     tone = (runtime.site_banner_tone or "info").strip().lower()
     if tone not in _BANNER_TONES:
         tone = "info"
@@ -24,8 +26,11 @@ def _build_site_info(include_changelog: bool) -> Dict[str, Any]:
             "enabled": bool(runtime.site_banner_enabled and banner_message),
             "message": banner_message,
             "tone": tone,
+            "backgroundColor": normalize_banner_color(runtime.site_banner_background_color),
+            "borderColor": normalize_banner_color(runtime.site_banner_border_color),
         },
         "login": {
+            "message": login_message,
             "showJellyfinLogin": bool(runtime.site_login_show_jellyfin_login),
             "showLocalLogin": bool(runtime.site_login_show_local_login),
             "showForgotPassword": bool(runtime.site_login_show_forgot_password),