feat(MemberOrders): implement member orders feature

- Added new models and routes for managing member orders and order history.
- Updated server.js to include member order routes and sync functionality.
- Enhanced frontend with new components and dialogs for viewing and managing orders.
- Integrated internationalization support for order-related texts across multiple languages.
- Updated navigation and views to include access to the new orders feature, improving user experience.

docs/manual_sql_migrations.md

@@ -67,3 +67,55 @@ ALTER TABLE participants
 Rueckwaertskompatibilitaet:
 
 - Bestehende Datensaetze bleiben durch den Default `present` gueltig.
+
+## 2026-03-24
+
+### `member_orders`
+
+```sql
+CREATE TABLE IF NOT EXISTS member_orders (
+  id INT NOT NULL AUTO_INCREMENT,
+  member_id INT NOT NULL,
+  club_id INT NOT NULL,
+  item VARCHAR(255) NOT NULL,
+  status ENUM('requested', 'ordered', 'arrived', 'handed_over') NOT NULL DEFAULT 'requested',
+  order_date DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  status_date DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  cost DECIMAL(10,2) NOT NULL DEFAULT 0.00,
+  paid_amount DECIMAL(10,2) NOT NULL DEFAULT 0.00,
+  created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  PRIMARY KEY (id),
+  KEY idx_member_orders_member_id (member_id),
+  KEY idx_member_orders_club_id (club_id),
+  KEY idx_member_orders_status (status)
+);
+```
+
+### `member_order_history`
+
+```sql
+CREATE TABLE IF NOT EXISTS member_order_history (
+  id INT NOT NULL AUTO_INCREMENT,
+  member_order_id INT NOT NULL,
+  member_id INT NOT NULL,
+  club_id INT NOT NULL,
+  item VARCHAR(255) NOT NULL,
+  status ENUM('requested', 'ordered', 'arrived', 'handed_over') NOT NULL,
+  changed_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  cost DECIMAL(10,2) NOT NULL DEFAULT 0.00,
+  paid_amount DECIMAL(10,2) NOT NULL DEFAULT 0.00,
+  created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  PRIMARY KEY (id),
+  KEY idx_member_order_history_order_id (member_order_id),
+  KEY idx_member_order_history_member_id (member_id),
+  KEY idx_member_order_history_club_id (club_id),
+  KEY idx_member_order_history_changed_at (changed_at)
+);
+```
+
+Rueckwaertskompatibilitaet:
+
+- Das Feature ist additiv. Bestehende Mitglieder- und Vereinstabellen werden nicht veraendert.
+- Das Frontend funktioniert auch ohne Bestelldaten; die neuen Tabellen werden nur fuer das Feature genutzt.