Initial LabelPrintAgent scaffold

sql/create_label_print_queue.sql

@@ -0,0 +1,29 @@
+CREATE TABLE IF NOT EXISTS label_print_queue (
+    id BIGINT AUTO_INCREMENT PRIMARY KEY,
+    layout_key VARCHAR(100) NOT NULL,
+    payload_json JSON NOT NULL,
+    status ENUM('pending','printing','printed','error','deleted') NOT NULL DEFAULT 'pending',
+    printer_name VARCHAR(255) NULL,
+    attempts INT NOT NULL DEFAULT 0,
+    error_message TEXT NULL,
+    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    locked_at DATETIME NULL,
+    printed_at DATETIME NULL,
+    INDEX idx_label_print_queue_status_created (status, created_at),
+    INDEX idx_label_print_queue_layout_key (layout_key)
+);
+
+INSERT INTO label_print_queue
+(layout_key, payload_json, status)
+VALUES
+(
+  'dymo_57x32_standard',
+  JSON_OBJECT(
+    'titel', 'Beleg privat',
+    'beschreibung', 'Dokument 2026-000123',
+    'nummer', '2026-000123',
+    'datum', '2026-05-07',
+    'qr', 'bjoernprivat 0000123'
+  ),
+  'pending'
+);