refactor(assets): vendor 资产迁入标准目录并全仓去除 zibll 标识

- assets/vendor 全量迁移: fontawesome5→assets/fontawesome5, css→assets/css,
  js→assets/js/runtime(避开 14 个同名自有文件), img 合并去重→assets/img,
  fonts→assets/fonts; 删除 assets/vendor
- libs 五个与 widgets/third-party 字节相同的库不重复入库, loader paths 改指向
- 运行时切换: _win.uri=assets 根, loader baseUrl=/js/runtime, enlighter 注入
  路径同步; PHP 7 个引用文件切换并改名 $zibll_*→$runtime_*
- 去品牌: Qinver 头注释/品牌 console.log/演示链接清除, 默认文案中性化
- 功能标识符改名: zib__→aksrt__, zib_ajax→aksrt_ajax, window.zib→
  window.aksrtLegacy, zibllblock/*→aksrtblock/*, .zib-widget→.aksrt-panel,
  .zib-slider→.aksrt-slider, zib_menu_options meta 键等
- 自有 CSS 改名: legacy-utilities/compat-vars/footer shell
- admin SPA 重建; 契约测试同步(路径/断言/文件更名)
- 例外保留: tests/visual 对照环境与 fixtures 前缀(外部 Zibll 产品引用)

验证: php -l 133 个改动文件通过; runtime 86 个 JS node --check 通过;
契约测试 68/70(2 个失败经 stash 对照确认为存量问题)

assets/css/core/buttons.css

@@ -1,7 +1,7 @@
 /**
- * AKSRT Buttons — 1:1 Zibll Alignment
+ * AKSRT Buttons — 1:1 legacy Alignment
  *
- * 对齐 zibll .but 系统：
+ * 对齐 legacy .but 系统：
  * - 正常字重 (normal)
  * - 4px 圆角
  * - 灰色默认背景
@@ -22,7 +22,7 @@
   height: var(--btn-h);
   padding: 0 var(--btn-px);
   font-size: var(--text-sm);
-  font-weight: normal; /* zibll .but: normal — was 500 */
+  font-weight: normal; /* legacy .but: normal — was 500 */
   line-height: 1.44;
   border: 1px solid transparent;
   border-radius: var(--radius-btn);
@@ -42,7 +42,7 @@
 .btn-sm { --btn-h: 28px; --btn-px: 8px; font-size: var(--text-xs); }
 .btn-lg { --btn-h: 44px; --btn-px: 18px; font-size: var(--text-base); }
 
-/* === Default (gray background, like zibll .but default) === */
+/* === Default (gray background, like legacy .but default) === */
 .btn {
   background: rgba(136, 136, 136, 0.1);
   color: #888;
@@ -141,18 +141,18 @@
 }
 
 /* ============================================================
- * Zibll .but / .badg compat layer — 1:1 zibll main.css (.but system)
+ * legacy .but / .badg compat layer — 1:1 legacy main.css (.but system)
  * ------------------------------------------------------------
  * Additive: does NOT alter the AKSRT .btn system above. Lets reused
- * zibll-style markup (.but / .badg / .b-* / .jb-* / .c-* / .but-group /
+ * legacy-style markup (.but / .badg / .b-* / .jb-* / .c-* / .but-group /
  * .but-average / .toggle-radius) render via the --this-* context-coloring vars.
  * The --this-* DEFAULTS are set on the base rule here (BEFORE the .b-*/.jb-*
  * modifiers) so the cascade resolves colored variants correctly; scoped to
  * .but/.badg (never :root) so .float-btn's own var(--this-*, fallback) stays intact.
- * Consumes --focus-color-opacity* from zibll-compat-vars.css.
+ * Consumes --focus-color-opacity* from compat-vars.css.
  * ============================================================ */
 
-/* Base (zibll .but / .badg) */
+/* Base (legacy .but / .badg) */
 .but,
 .badg {
   display: inline-block;
@@ -254,7 +254,7 @@
 .active.badg.hollow,
 .active > .hollow:not(.vip-tag) { --this-color: var(--focus-color); }
 
-/* toggle-radius (round 29px toggle) — zibll 1:1 */
+/* toggle-radius (round 29px toggle) — legacy 1:1 */
 .toggle-radius {
   background: var(--this-bg);
   width: 29px;
@@ -266,7 +266,7 @@
   vertical-align: text-top;
   --this-bg: var(--main-border-color);
 }
-/* zibll groups these with abs-* : absolute + vertical center; then pin left/right 0 */
+/* legacy groups these with abs-* : absolute + vertical center; then pin left/right 0 */
 .toggle-radius .fa,
 .toggle-radius .icon,
 .toggle-radius > i {
@@ -308,7 +308,7 @@
 .b-purple { --this-bg: #d448f5; }
 .b-black  { --this-bg: #121517; }
 
-/* gradient modifiers (zibll .jb-*) */
+/* gradient modifiers (legacy .jb-*) */
 .jb-red    { --this-bg: linear-gradient(135deg, #fd7a64 10%, #fb2d2d 100%); }
 .jb-yellow { --this-bg: linear-gradient(135deg, #f99d4d 10%, #f7631d 100%); }
 .jb-blue   { --this-bg: linear-gradient(135deg, #59c3fb 10%, #268df7 100%); }
@@ -318,7 +318,7 @@
 .jb-vip1   { --this-bg: linear-gradient(25deg, #eabe7b 10%, #f5e3c7 70%, #edc788 100%); --this-color: #866127; }
 .jb-vip2   { --this-bg: linear-gradient(317deg, #4d4c4c 30%, #7b7b7b 70%, #5f5c5c 100%); --this-color: #ddd; }
 
-/* text-color modifiers (zibll .c-*) — set --this-color + light --this-bg */
+/* text-color modifiers (legacy .c-*) — set --this-color + light --this-bg */
 .c-theme, .c-gray, .c-white, .c-red, .c-red-2, .c-yellow, .c-blue, .c-blue-2,
 .c-green, .c-cyan, .c-purple { color: var(--this-color); }
 .c-theme  { --this-color: var(--focus-color); --this-bg: var(--focus-color-opacity1); }