feat: add subtle creator attribution

- HTML comment in base.html with project description and link
- Small fixed footer in bottom-right corner: Crafted by mycloud24
- Footer styled to be unobtrusive (low opacity, small font)

app/static/css/style.css

@@ -3,3 +3,4 @@
 @media(max-width:1100px){.stats-grid{grid-template-columns:repeat(2,1fr)}}
 @media(max-width:991px){.app-sidebar{transform:translateX(-100%);transition:transform .22s}.sidebar-open .app-sidebar{transform:translateX(0)}.sidebar-open .sidebar-backdrop{display:block}.app-main{margin-left:0}.mobile-menu{display:grid}.content-wrap{padding:26px 20px}.checkin-grid{grid-template-columns:1fr}}
 @media(max-width:620px){.app-topbar{height:66px;padding:0 14px}.topbar-context small{display:none}.event-switcher{max-width:46vw}.page-header{align-items:flex-start;flex-direction:column}.page-header .btn{width:100%}.stats-grid{grid-template-columns:1fr 1fr;gap:10px}.stat-card{padding:16px}.stat-value{font-size:1.65rem}.module-grid{grid-template-columns:1fr}.public-header{height:68px;padding:0 16px}.public-content{padding-top:22px}.table-responsive{border-radius:14px}}
+.app-footer{position:fixed;bottom:8px;right:12px;font-size:.65rem;color:#3a4b5e;opacity:.6;z-index:1}.app-footer a{color:inherit;text-decoration:none}.app-footer a:hover{color:var(--muted)}