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/models/src/queries/user.rs

@@ -0,0 +1,9 @@
+use serde::Deserialize;
+use utoipa::IntoParams;
+
+#[derive(Deserialize, Default, IntoParams)]
+#[into_params(style = Form, parameter_in = Query)]
+pub struct UserQuery {
+    #[param(nullable = true)]
+    pub username: Option<String>,
+}