add testcase panel.

src/oj/store/code.ts

@@ -0,0 +1,10 @@
+import { Code } from "../../utils/types"
+
+export const useCodeStore = defineStore("code", () => {
+  const code = reactive<Code>({
+    value: "",
+    language: "C",
+  })
+
+  return { code }
+})

src/oj/store/signup.ts

@@ -0,0 +1,13 @@
+export const useSignupStore = defineStore("signup", () => {
+  const [visible] = useToggle()
+
+  function show() {
+    visible.value = true
+  }
+
+  function hide() {
+    visible.value = false
+  }
+
+  return { visible, show, hide }
+})