style(theme): update font sizes and spacing for better readability

Adjust default font size from 13px to 14px and modify blockquote styling
Convert fixed pixel values to relative em units for better scalability
Improve spacing and typography consistency across components

docs/.vitepress/theme/style.css

@@ -2,7 +2,7 @@
   /* Easy-Vibe Theme Fix v2025-01-12 */
   /* 通过变量控制分组底部留白（默认 24px） */
   --vp-sidebar-nav-section-gap: 8px;
-  --ev-doc-font-size: 13px;
+  --ev-doc-font-size: 14px;
   --ev-doc-line-height: 1.65;
 }
 
@@ -29,13 +29,25 @@
 }
 
 .vp-doc blockquote {
-  font-size: 0.9em !important;
+  font-size: inherit !important;
+  line-height: var(--ev-doc-line-height) !important;
   color: var(--vp-c-text-2);
+  margin: 16px 0 !important;
+  padding: 0 0 0 16px !important;
 }
 
 .vp-doc blockquote p {
   font-size: inherit !important;
-  line-height: 1.4 !important;
+  line-height: inherit !important;
+  margin: 8px 0 !important;
+}
+
+.vp-doc blockquote p:first-child {
+  margin-top: 0 !important;
+}
+
+.vp-doc blockquote p:last-child {
+  margin-bottom: 0 !important;
 }
 
 .vp-doc :where(li) {