feat: add initial frontend setup with styles, types, and testing framework

- Created a global CSS file for styling the frontend with responsive design.
- Introduced TypeScript types for various entities including Research, Alpha, and Account.
- Implemented Playwright tests for account management and data synchronization workflows.
- Configured TypeScript with strict settings and included necessary libraries.
- Set up Vite as the build tool with React plugin and API proxy configuration.
- Added a Python script to initialize environment variables securely.

Dockerfile.frontend

@@ -0,0 +1,12 @@
+FROM node:22-bookworm-slim AS build
+WORKDIR /app
+RUN corepack enable && corepack prepare pnpm@9.15.0 --activate
+COPY frontend/package.json frontend/pnpm-lock.yaml ./
+RUN pnpm install --frozen-lockfile
+COPY frontend/ ./
+RUN pnpm build
+
+FROM caddy:2-alpine
+COPY Caddyfile /etc/caddy/Caddyfile
+COPY --from=build /app/dist /srv
+EXPOSE 80 443