refactor: 统一命名与主题色，我的页合并设置入口与缓存清理

src/composables/useCacheCleaner.ts

@@ -0,0 +1,55 @@
+import { ref } from "vue";
+import { useToast } from "@wot-ui/ui";
+import { Storage } from "@/utils/storage";
+import { formatBytes } from "@/utils/format";
+
+/**
+ * 缓存体积与清理
+ *
+ * 只统计并清理可重建的缓存（如用户信息缓存），登录态与主题偏好不参与，
+ * 避免像 uni.clearStorage() 那样把 token 一起清掉导致下次启动退出登录。
+ */
+export function useCacheCleaner() {
+  const toast = useToast();
+  const usageText = ref("计算中...");
+  const isClearing = ref(false);
+
+  async function loadUsage() {
+    try {
+      usageText.value = formatBytes(Storage.getClearableBytes());
+    } catch {
+      usageText.value = "获取失败";
+    }
+  }
+
+  async function clear() {
+    if (usageText.value === "获取失败") {
+      toast.info("获取缓存信息失败，请稍后重试");
+      return;
+    }
+    if (isClearing.value) {
+      return;
+    }
+    if (usageText.value === "0B") {
+      toast.info("暂无缓存需要清理");
+      return;
+    }
+
+    try {
+      isClearing.value = true;
+      const removed = Storage.clearCache();
+      await loadUsage();
+      if (removed > 0) {
+        toast.success("清理成功");
+      } else {
+        toast.info("暂无缓存需要清理");
+      }
+    } catch {
+      toast.error("清理失败");
+    } finally {
+      isClearing.value = false;
+    }
+  }
+
+  return { usageText, isClearing, loadUsage, clear };
+}