feat(badges): configurable punch-out hole markers for badge clip slots

Adds cfg_json.punch_holes.{left,right,center} to mark pre-perforated badge
clip slots with X overlays. Slots are 5/8in x 1/8in, 1/4in from top,
3/8in from left/right edges. Markers print on the badge so attendees know
where to push out the perforations. Template form exposes checkboxes in
Header & Branding. Documented in MODULE__AE_Events_Badge_Templates.md.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/lib/ae_events/types/ae_badge_template_cfg.ts

@@ -52,6 +52,16 @@ export interface BadgeTemplateCfg {
     // Any CSS length: "0.5in", "1rem". Unset = no extra padding.
     header_padding_bottom?: string;
 
+    // Punch-out hole markers: show X overlays at the physical badge clip slot positions.
+    // Slots are pre-perforated on the badge stock — markers guide attendees to push them out.
+    // Hole dimensions: 5/8in wide × 1/8in tall, 1/4in from top, 3/8in from left/right edges.
+    // Center hole: horizontally centered, same vertical position.
+    punch_holes?: {
+        left?: boolean;
+        right?: boolean;
+        center?: boolean;
+    };
+
     // Allow arbitrary extra keys to preserve forward-compatibility.
     [key: string]: any;
 }