feat: add tests for import polling, login page, money utilities, and query keys

- Implemented tests for import polling functionality, ensuring correct behavior for active and terminal import statuses.
- Created tests for the login page, validating user interactions and error handling.
- Added unit tests for money utility functions, covering parsing, formatting, and summation of monetary values.
- Developed tests for query keys, ensuring proper scoping and invalidation roots.

chore: setup testing environment and configuration

- Added setup file for testing with Vitest and Testing Library.
- Configured TypeScript and Vite for the frontend project.
- Created Docker and Nginx configurations for local development and production environments.
- Established a PostgreSQL initialization script for setting up application roles.

docs: add README and environment configuration for infra

- Included README for the infra directory, detailing local development setup and service descriptions.
- Created an example environment configuration file for local development with placeholders for sensitive information.

frontend/public/favicon.svg

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+  <rect x="0.5" y="0.5" width="31" height="31" rx="6.5" fill="none" stroke="#24354f"/>
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+  <path d="M8 16h10" stroke="#fbbf24" stroke-width="2.5" stroke-linecap="round"/>
+  <path d="M8 10h16" stroke="#9db0c9" stroke-width="2.5" stroke-linecap="round"/>
+</svg>