v0.6.0: mark Climperor Web shell and SEO milestone.

Brand title uses self-hosted Noto Serif SC; document minor vs patch SITE_VERSION bumps.

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

web/frontend/style.css

@@ -19,6 +19,8 @@
 
   /* Typography */
   --font: "Segoe UI", "Microsoft YaHei UI", "PingFang SC", sans-serif;
+  /* Brand mark only (「上分帝」); self-hosted Noto Serif SC subset */
+  --font-brand: "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
   --fs-display: 32px;
   --fs-page: 22px;
   --fs-title-lg: 18px;
@@ -65,6 +67,15 @@
   --focus-ring: 2px solid var(--sel);
 }
 
+@font-face {
+  font-family: "Noto Serif SC";
+  font-style: normal;
+  font-weight: 700;
+  font-display: swap;
+  src: url("/fonts/noto-serif-sc-brand-700.woff2") format("woff2");
+  unicode-range: U+4E0A, U+5206, U+5E1D; /* 上分帝 */
+}
+
 * { box-sizing: border-box; }
 html, body {
   margin: 0;
@@ -196,6 +207,7 @@ body {
   display: block;
 }
 .brand-title {
+  font-family: var(--font-brand);
   font-size: var(--fs-title-lg);
   font-weight: var(--fw-bold);
   letter-spacing: 0.16em;
@@ -4079,6 +4091,7 @@ html.mobile-client #mobile-gate {
   display: block;
 }
 .mobile-gate-brand-title {
+  font-family: var(--font-brand);
   font-size: var(--fs-title-lg);
   font-weight: var(--fw-bold);
   letter-spacing: 0.16em;