feat: initialize thoughts-frontend with Next.js, TypeScript, and ESLint

- Add ESLint configuration for Next.js and TypeScript support.
- Create Next.js configuration file with standalone output option.
- Initialize package.json with scripts for development, build, and linting.
- Set up PostCSS configuration for Tailwind CSS.
- Add SVG assets for UI components.
- Create TypeScript configuration for strict type checking and module resolution.

thoughts-backend/tests/api/root.rs

@@ -0,0 +1,12 @@
+use axum::{http::StatusCode, Router};
+use http_body_util::BodyExt;
+
+use utils::testing::make_get_request;
+
+pub(super) async fn test_root(app: Router) {
+    let response = make_get_request(app, "/").await;
+    assert_eq!(response.status(), StatusCode::OK);
+
+    let body = response.into_body().collect().await.unwrap().to_bytes();
+    assert_eq!(&body[..], b"Hello, World from DB!");
+}