refactor: migrate demo applications to playground (#4116)

* chore: detail adjustment

* refactor: Migrate demo applications to playground

* perf: logic optimization

* chore: update docs

* chore: update docs

playground/tsconfig.json

@@ -0,0 +1,12 @@
+{
+  "$schema": "https://json.schemastore.org/tsconfig",
+  "extends": "@vben/tsconfig/web-app.json",
+  "compilerOptions": {
+    "baseUrl": ".",
+    "paths": {
+      "#/*": ["./src/*"]
+    }
+  },
+  "references": [{ "path": "./tsconfig.node.json" }],
+  "include": ["src/**/*.ts", "src/**/*.tsx", "src/**/*.vue"]
+}