feat: donate links on login screen + unified README support block

- public/index.html: gate-donate nav with Boosty/Ozon/Telegram on login
- public/styles.css: .gate-donate styles
- landing: proj-support-strip
- README: blockquote + "Поддержка проекта" section
- .github/FUNDING.yml: added
- version bumped to 1.2.28

Co-authored-by: Cursor <cursoragent@cursor.com>

landing/styles.css

@@ -839,6 +839,45 @@ body {
   text-align: right;
 }
 
+.proj-support-strip {
+  border-bottom: 1px solid var(--border);
+  background: linear-gradient(90deg, rgba(29, 158, 117, 0.12), rgba(55, 138, 221, 0.08));
+  padding: 0.4rem 1rem;
+}
+
+.proj-support-inner {
+  max-width: 900px;
+  margin: 0 auto;
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  justify-content: center;
+  gap: 0.35rem 0.65rem;
+  font-size: 12px;
+  color: var(--muted);
+}
+
+.proj-support-lead {
+  margin-right: 0.25rem;
+  opacity: 0.95;
+}
+
+.proj-support-dot {
+  opacity: 0.35;
+  user-select: none;
+}
+
+.proj-support-inner a {
+  color: #5fd8b0;
+  text-decoration: none;
+  white-space: nowrap;
+  font-weight: 600;
+}
+
+.proj-support-inner a:hover {
+  text-decoration: underline;
+}
+
 .site-footer {
   border-top: 1px solid var(--border);
   padding: 1.75rem 1.5rem 2rem;