feat: initialize pnpm workspace and add app structure

- Created pnpm workspace configuration in `pnpm-workspace.yaml`.
- Implemented basic app setup in `src/app.ts` using `@kevisual/router`.
- Generated documentation files in `src/generated/docs.ts` for showcase CMS templates.
- Added inline script to read and compile markdown files into TypeScript constants in `src/inline.ts`.
- Set up main application entry point in `src/main.ts` to integrate routing and plugins.
- Established routing structure in `src/routes/index.ts` and `src/routes/md.ts` for handling markdown-related tasks.
- Implemented a route for initializing web todo tasks with dynamic content generation based on selected template type.

src/app.ts

@@ -0,0 +1,3 @@
+import { App } from '@kevisual/router'
+import { useContextKey } from '@kevisual/context'
+export const app = useContextKey('app', () => new App());