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

assets/admin/src/components/floating/FloatBtnCommonFields.vue

@@ -0,0 +1,84 @@
+<template>
+  <n-form label-placement="left" label-width="110" class="aksrt-form float-common-fields">
+    <n-form-item label="PC端显示" :show-feedback="false">
+      <n-switch :value="!!modelValue.pc_s" @update:value="update('pc_s', $event)" />
+    </n-form-item>
+    <n-form-item label="移动端显示" :show-feedback="false">
+      <n-switch :value="!!modelValue.m_s" @update:value="update('m_s', $event)" />
+    </n-form-item>
+    <n-form-item label="颜色" :show-feedback="false">
+      <div class="float-common-fields__colors">
+        <div class="float-common-fields__color">
+          <span>自定义图标颜色</span>
+          <n-color-picker
+            :value="modelValue.color?.color || null"
+            :show-alpha="true"
+            :modes="['hex', 'rgb']"
+            clearable
+            @update:value="updateColor('color', $event)"
+          />
+        </div>
+        <div class="float-common-fields__color">
+          <span>自定义背景颜色</span>
+          <n-color-picker
+            :value="modelValue.color?.bg || null"
+            :show-alpha="true"
+            :modes="['hex', 'rgb']"
+            clearable
+            @update:value="updateColor('bg', $event)"
+          />
+        </div>
+      </div>
+    </n-form-item>
+    <div class="float-common-fields__desc">自定义颜色请注意日间、夜间模式的适配</div>
+  </n-form>
+</template>
+
+<script setup>
+const props = defineProps({
+  modelValue: { type: Object, required: true },
+})
+const emit = defineEmits(['update:modelValue'])
+
+function update(key, value) {
+  emit('update:modelValue', { ...props.modelValue, [key]: value })
+}
+
+function updateColor(key, value) {
+  emit('update:modelValue', {
+    ...props.modelValue,
+    color: { ...(props.modelValue.color || { color: '', bg: '' }), [key]: value || '' },
+  })
+}
+</script>
+
+<style scoped>
+.float-common-fields {
+  display: flex;
+  flex-direction: column;
+  gap: 10px;
+}
+
+.float-common-fields__colors {
+  display: flex;
+  gap: 16px;
+  flex-wrap: wrap;
+  width: 100%;
+}
+
+.float-common-fields__color {
+  display: flex;
+  flex-direction: column;
+  gap: 4px;
+  min-width: 180px;
+  flex: 1;
+  font-size: 12px;
+  color: var(--n-text-color-3);
+}
+
+.float-common-fields__desc {
+  font-size: 12px;
+  color: var(--n-text-color-3);
+  padding-left: 110px;
+}
+</style>