Update features on home page

web/src/lib/config.ts

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+// This file is part of the happyDeliver (R) project.
+// Copyright (c) 2025 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+import { writable } from "svelte/store";
+
+interface AppConfig {
+    report_retention?: number;
+}
+
+const defaultConfig: AppConfig = {
+    report_retention: 0,
+};
+
+function getConfigFromScriptTag(): AppConfig | null {
+    if (typeof document !== "undefined") {
+        const configScript = document.getElementById("app-config");
+        if (configScript) {
+            try {
+                return JSON.parse(configScript.textContent || "");
+            } catch (e) {
+                console.error("Failed to parse app config:", e);
+            }
+        }
+    }
+    return null;
+}
+
+const initialConfig = getConfigFromScriptTag() || defaultConfig;
+
+export const appConfig = writable<AppConfig>(initialConfig);