fix: resolve GitHub Pages build warnings

- Add CalSans-SemiBold.woff2 font (306KB)
- Remove Inter TTF @font-face rules (use system font fallback)
- Move uno.config.ts to docs/ root to fix config path warning

Author: LessUp

docs/.vitepress/theme/style.css

@@ -295,38 +295,7 @@
    Layer: Fonts
    ============================================ */
 @layer fonts {
-  /* Inter - Primary UI Font */
-  @font-face {
-    font-family: 'Inter';
-    src: url('/fonts/Inter-Regular.ttf') format('truetype');
-    font-weight: 400;
-    font-style: normal;
-    font-display: swap;
-  }
-
-  @font-face {
-    font-family: 'Inter';
-    src: url('/fonts/Inter-Medium.ttf') format('truetype');
-    font-weight: 500;
-    font-style: normal;
-    font-display: swap;
-  }
-
-  @font-face {
-    font-family: 'Inter';
-    src: url('/fonts/Inter-SemiBold.ttf') format('truetype');
-    font-weight: 600;
-    font-style: normal;
-    font-display: swap;
-  }
-
-  @font-face {
-    font-family: 'Inter';
-    src: url('/fonts/Inter-Bold.ttf') format('truetype');
-    font-weight: 700;
-    font-style: normal;
-    font-display: swap;
-  }
+  /* Inter - 使用系统字体回退 (Inter TTF 文件未包含在仓库中) */
 
   /* Cal Sans - Display Font */
   @font-face {