feat: Robotex landing on robotex.sokolab.xyz and announcement post

- projects section: standalone landing template and styles, served on a
  subdomain by the ingress Caddy (project) snippet
- Robotex landing in RU/EN, links to Redmine forum/issues
- blog post: Robotex is now a free service

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

assets/css/landing.css

@@ -0,0 +1,120 @@
+/* Project landing pages (layouts/projects/single.html). Standalone, no theme CSS. */
+
+:root {
+  --bg: #0b1020;
+  --bg-alt: #10172b;
+  --surface: rgba(255, 255, 255, .04);
+  --border: rgba(255, 255, 255, .09);
+  --text: #e6e9f2;
+  --muted: #9aa3b8;
+  --accent: #7c8cff;
+  --accent-strong: #5b6cf0;
+  --code-bg: #070b16;
+  --radius: .9rem;
+}
+
+* { box-sizing: border-box; }
+html { scroll-behavior: smooth; }
+body {
+  margin: 0;
+  background: var(--bg);
+  color: var(--text);
+  font: 400 1rem/1.6 'Inter', system-ui, sans-serif;
+  -webkit-font-smoothing: antialiased;
+}
+a { color: var(--accent); }
+code, pre { font-family: 'JetBrains Mono', monospace; }
+h1, h2, h3 { letter-spacing: -.02em; line-height: 1.15; margin: 0; }
+h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); font-weight: 800; }
+h3 { font-size: 1.05rem; font-weight: 600; }
+
+.wrap { width: min(100% - 2rem, 1040px); margin-inline: auto; }
+
+/* nav */
+.nav {
+  position: sticky; top: 0; z-index: 10;
+  background: rgba(11, 16, 32, .8);
+  backdrop-filter: blur(10px);
+  border-bottom: 1px solid var(--border);
+}
+.nav__row { display: flex; align-items: center; justify-content: space-between; gap: 1rem; height: 3.5rem; }
+.nav__logo { font-weight: 800; font-size: 1.15rem; color: var(--text); text-decoration: none; }
+.nav__links { display: flex; align-items: center; gap: 1.25rem; }
+.nav__links a { color: var(--muted); text-decoration: none; font-size: .9rem; }
+.nav__links a:hover { color: var(--text); }
+.nav__lang { padding: .15rem .5rem; border: 1px solid var(--border); border-radius: .4rem; }
+@media (max-width: 640px) {
+  .nav__links a:not(.nav__lang) { display: none; }
+}
+
+/* hero */
+.hero {
+  padding: clamp(4rem, 12vw, 7.5rem) 0 clamp(3rem, 8vw, 5rem);
+  background:
+    radial-gradient(60rem 30rem at 50% -10%, rgba(124, 140, 255, .22), transparent 70%),
+    var(--bg);
+  text-align: center;
+}
+.badge {
+  display: inline-block; margin: 0 0 1.25rem; padding: .3rem .8rem;
+  border: 1px solid rgba(124, 140, 255, .4); border-radius: 999px;
+  color: var(--accent); font-size: .85rem; font-weight: 600;
+}
+.hero__title { font-size: clamp(2.2rem, 6vw, 3.6rem); font-weight: 800; max-width: 18ch; margin-inline: auto; }
+.hero__lead { max-width: 40rem; margin: 1.25rem auto 0; color: var(--muted); font-size: 1.15rem; }
+.hero__cta { display: flex; flex-wrap: wrap; justify-content: center; gap: .75rem; margin-top: 2rem; }
+
+.btn {
+  display: inline-block; padding: .75rem 1.4rem; border-radius: .7rem;
+  border: 1px solid var(--border); background: var(--surface);
+  color: var(--text); font-weight: 600; text-decoration: none;
+  transition: background .15s, transform .15s;
+}
+.btn:hover { background: rgba(255, 255, 255, .08); transform: translateY(-1px); }
+.btn--primary { background: var(--accent-strong); border-color: var(--accent-strong); color: #fff; }
+.btn--primary:hover { background: var(--accent); }
+
+/* sections */
+.section { padding: clamp(3rem, 8vw, 5rem) 0; scroll-margin-top: 3.5rem; }
+.section--alt { background: var(--bg-alt); border-block: 1px solid var(--border); }
+.section__lead { color: var(--muted); max-width: 44rem; margin: .75rem 0 0; font-size: 1.05rem; }
+
+.problems { margin: 1.5rem 0; padding: 0; list-style: none; display: grid; gap: .6rem; counter-reset: p; }
+.problems li {
+  counter-increment: p; display: flex; gap: .9rem; align-items: center;
+  padding: .8rem 1rem; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface);
+}
+.problems li::before {
+  content: counter(p); flex: none; display: grid; place-items: center;
+  width: 1.8rem; height: 1.8rem; border-radius: 50%;
+  background: rgba(124, 140, 255, .15); color: var(--accent); font-weight: 600; font-size: .9rem;
+}
+
+.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(18rem, 1fr)); gap: 1rem; margin-top: 2rem; }
+.grid--4 { grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr)); }
+.card { padding: 1.25rem; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }
+.card p { margin: .5rem 0 0; color: var(--muted); font-size: .95rem; }
+.card code { font-size: .85em; color: var(--text); }
+.card--link { text-decoration: none; color: var(--text); transition: border-color .15s, transform .15s; }
+.card--link:hover { border-color: rgba(124, 140, 255, .5); transform: translateY(-2px); }
+.card--link h3 { color: var(--accent); }
+
+.steps { margin: 1.5rem 0 0; padding-left: 1.25rem; display: grid; gap: .4rem; }
+.steps code { font-size: .9em; }
+
+.code { display: grid; gap: 1rem; margin-top: 2rem; }
+.code figure { margin: 0; min-width: 0; }
+.code figcaption { color: var(--muted); font-size: .85rem; margin-bottom: .4rem; }
+.code pre {
+  margin: 0; padding: 1rem; overflow-x: auto;
+  background: var(--code-bg); border: 1px solid var(--border); border-radius: var(--radius);
+  font-size: .82rem; line-height: 1.5; color: #c9d1e8; tab-size: 2;
+}
+
+.limits { margin: 1.5rem 0 0; padding-left: 1.25rem; display: grid; gap: .5rem; color: var(--muted); }
+.limits strong { color: var(--text); }
+
+/* footer */
+.footer { padding: 2rem 0; border-top: 1px solid var(--border); color: var(--muted); font-size: .9rem; }
+.footer__row { display: flex; flex-wrap: wrap; justify-content: space-between; gap: .5rem 2rem; }
+.footer p { margin: 0; }