fix(single): align article code blocks with the reference theme

The article body ran two highlighting pipelines at once: the runtime
EnlighterJS pass (same one the comment area uses) plus a bespoke
precode.js enhancer, and a hand-rolled .code-block skin. The two
disagreed, so rendered blocks carried a dark #282c34 card with 15px
padding, 14px text, a border and a second copy button stacked on top of
the EnlighterJS toolbar.

Drop the parallel path and let one pipeline own code blocks:
- delete precode.js, single-post/code-blocks.css and the unused
  assets/js/enlighter copy that only precode.js referenced
- drop the now-dead has_code requirement (PHP scan + feature enqueue)
- render pre exactly as the reference does: bootstrap's pre box
  (9.5px padding / 13px / radius 4) plus main.css's muted background,
  with the EnlighterJS theme supplying the skin

Also scope the inline-code skin to :not(pre code) so it stops painting
the block background pink, and remap the toolbar copy glyph: \f0ea is
the clipboard in FA4 but "paste" in FA5; the clipboard is \f328.

Verified against the reference at 1440px both themes: pre 13px/18.57,
9.5px padding, radius 4, muted background; EnlighterJS block heights
151.31 / 60.38 match exactly.

assets/js/runtime/enlighter/enlighterjs.css

@@ -67,12 +67,14 @@
     background: rgba(57, 60, 66, 0.87)
 }
 
+/* 字形码位随 FA5 重新映射：旧版 \f0ea 在 FA4 是剪贴板，FA5 里同码位变成
+ * 粘贴，剪贴板移到 \f328。其余两个码位在 FA5 中保持同名。 */
 .enlighter-default .enlighter-toolbar .enlighter-btn-raw::after {
     content: "\f121"
 }
 
 .enlighter-default .enlighter-toolbar .enlighter-btn-copy::after {
-    content: "\f0ea"
+    content: "\f328"
 }
 
 .enlighter-default .enlighter-toolbar .enlighter-btn-window::after {

assets/js/runtime/enlighter/enlighterjs.min.css

@@ -1 +1 @@
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assets/js/runtime/main.min.js

@@ -1 +1 @@
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