feat: add delete button to exports list and detail pages

Add DELETE /api/exports/{id} endpoint with cascade delete, trash icon
buttons on both the exports list and export detail pages, and disable
browser caching for static files to prevent stale JS issues.

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

FabWorks.Api/wwwroot/js/icons.js

@@ -9,6 +9,7 @@ const icons = {
     chevron: `<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><polyline points="9 18 15 12 9 6"/></svg>`,
     laser: `<svg viewBox="0 0 16 16" fill="none" stroke="var(--cyan)" stroke-width="1.2"><circle cx="8" cy="8" r="2"/><path d="M8 2v3M8 11v3M2 8h3M11 8h3" opacity="0.5"/></svg>`,
     bend: `<svg viewBox="0 0 16 16" fill="none" stroke="var(--amber)" stroke-width="1.2"><path d="M3 13V7a4 4 0 0 1 4-4h6"/><polyline points="10 6 13 3 10 0" transform="translate(0,2)"/></svg>`,
+    trash: `<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><polyline points="3 6 5 6 21 6"/><path d="M19 6l-1 14a2 2 0 0 1-2 2H8a2 2 0 0 1-2-2L5 6"/><path d="M10 11v6"/><path d="M14 11v6"/><path d="M9 6V4a1 1 0 0 1 1-1h4a1 1 0 0 1 1 1v2"/></svg>`,
 };
 
 function fileIcon(name) {