feat: add email sign up

src/utils/index.ts

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+export * from "./ionic-helper";
+export * from "./pattern";

src/utils/ionic-helper.ts

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+export type PageInstance = InstanceType<typeof import("@ionic/vue").IonPage>;

src/utils/pattern.ts

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+export const emailPattern = /^[^\s@]+@[^\s@][^\s.@]*\.[^\s@]+$/;