feat(float): rebuild right floating buttons 1:1 with reference theme

- Storage: aksrt_floating_buttons now uses reference float_btn shape
  (fixed 8 sortable types, more-buttons group); single source of
  defaults/sanitize in AKSRT\Settings\FloatButtons
- Admin SPA: CSF-parity page split into components/floating/*
- Frontend: aksrt_float_right() on wp_footer mirrors zib_float_right()
  (wp_is_mobile, PC tooltip, toggle-theme, ontop/scrollTopTo, qrcode,
  wechat/qq, pay_vip, add, more)
- CSS: floating-buttons.css rewritten from reference rules; legacy float
  rules removed from main/part/shell/overlay-primitives
- Remove dead code: reorder route/API, get_floating_buttons_items,
  floatingSchema, floatActionsId, float-theme-toggle bindings,
  common/floating.css, aksrt-runtime-win.php, .aksrt-float-btn

tools/admin-contract-report.json

@@ -1,5 +1,5 @@
 {
-    "generated_at": "2026-09-24T08:11:53+00:00",
+    "generated_at": "2026-09-26T12:42:35+00:00",
     "errors": [],
     "warnings": [
         "customPage tools-update section 'tools/update' not in PHP schema (ok if pure operational page)",
@@ -61,7 +61,7 @@
     ],
     "info": [
         "PHP schema domains: global, page_display, post_list, permissions, users, payment, extensions, tools, ExtensionsAudit, ExtensionsIP, ExtensionsPush, ToolsBackup, ToolsHealth, ToolsImportExport",
-        "Menu pages discovered: 61",
+        "Menu pages discovered: 60",
         "admin build ok; chunks=30"
     ],
     "domains": {
@@ -118,7 +118,6 @@
             "sections": [
                 "attachment",
                 "capabilities",
-                "download",
                 "login",
                 "moderation"
             ],
@@ -227,13 +226,13 @@
             ]
         }
     },
-    "page_count": 61,
+    "page_count": 60,
     "build": {
         "present": true,
         "entry": true,
         "missing_chunks": [],
         "chunks": [
-            "SchemaPage.QsKL1FOA.js",
+            "SchemaPage.DXZIPvzD.js",
             "vendor-vue.BYzo-2I-.js",
             "FaIcon.B3OOcphx.js",
             "FaIconPicker.DHrC0Y72.js",
@@ -248,8 +247,8 @@
             "vendor-draggable.YNevSrwY.js",
             "PageHeader.jmNZVzHG.js",
             "FooterTabbarSettings.CwSsjNlJ.js",
-            "PostPageSettings.DBCiH7_B.js",
-            "CommentSettings.DwLb53BZ.js",
+            "PostPageSettings.D7aU7Dv6.js",
+            "CommentSettings.CyFC7ABH.js",
             "PermissionsCapabilities.BeLUij9c.js",
             "CmsCredits.CTDJTkG-.js",
             "ThemeInfoPage.CbJKzVFa.js",