[P3] No ESLint or Prettier configured for the project

Priority: P3 Low | Risk: Low | Complexity: Medium

Problem

No code style enforcement exists. Naming inconsistencies (camelCase vs snake_case), inconsistent formatting, and no automated quality checks.

Files

• Project root

Acceptance Criteria

• Install and configure ESLint with Vue 3 plugin
• Install and configure Prettier
• Add lint and format scripts to package.json
• Fix all existing lint warnings