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/api/src/routers/root.rs

@@ -0,0 +1,30 @@
+use axum::{extract::State, routing::get, Router};
+use sea_orm::{ConnectionTrait, Statement};
+
+use app::state::AppState;
+
+use crate::error::ApiError;
+
+#[utoipa::path(
+    get,
+    path = "",
+    responses(
+        (status = 200, description = "Hello world", body = String)
+    )
+)]
+async fn root_get(state: State<AppState>) -> Result<String, ApiError> {
+    let result = state
+        .conn
+        .query_one(Statement::from_string(
+            state.conn.get_database_backend(),
+            "SELECT 'Hello, World from DB!'",
+        ))
+        .await
+        .map_err(ApiError::from)?;
+
+    result.unwrap().try_get_by(0).map_err(|e| e.into())
+}
+
+pub fn create_root_router() -> Router<AppState> {
+    Router::new().route("/", get(root_get))
+}