docs: add template literal types

src/app/posts/(TIL)/template-literal-types/page.mdx

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+---
+title: 模板字面量类型
+date: 2025-01-17T15:27:56.070Z
+duration: 1min
+---
+
+## 模板字面量类型（Template Literal Types）
+
+模板字面量类型是 TypeScript 中的一种类型，它允许你创建可以包含变量的字符串类型。
+
+```ts
+type World = "world";
+type Greeting = `hello ${World}`; // "hello world"
+```
+
+```ts
+type EmailLocaleIDs = "welcome_email" | "email_heading";
+type FooterLocaleIDs = "footer_title" | "footer_sendoff";
+
+type AllLocaleIDs = `${EmailLocaleIDs | FooterLocaleIDs}_id`;
+// "welcome_email_id" | "email_heading_id" | "footer_title_id" | "footer_sendoff_id"
+```
+
+## 相关文章
+
+- https://www.typescriptlang.org/docs/handbook/2/template-literal-types.html