chore(setup): configure drizzle ORM and eslint import sorting

[Nirbhay21]

Setup Drizzle ORM & ESLint Import Sorting

Summary

This PR sets up the initial backend foundation for SmartAssess by configuring Drizzle ORM with PostgreSQL, validating database connectivity via a sample table, and improving code quality with ESLint-based import sorting.

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What’s included

Database & ORM

• Added Drizzle ORM configuration (drizzle.config.ts)
• Configured direct database URL for migrations and Drizzle Studio
• Created an initial tasks table to verify DB connectivity
• Generated and committed:
  • SQL migration
  • Drizzle metadata (meta snapshot & journal)

Database integration

• Added database client setup using postgres-js
• Confirmed Drizzle queries and migrations work correctly

Linting & formatting

• Added eslint-plugin-simple-import-sort
• Enforced consistent import ordering across JS/TS files
• Updated ESLint flat config (ESLint v9 compatible)

Tooling improvements

• Added Drizzle scripts:
  • db:generate
  • db:migrate
  • db:studio
• Installed missing TypeScript typings for Express middleware
• Updated Express app with:
  • cors
  • helmet
  • compression

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How this was verified

• Drizzle migrations execute successfully
• Database connection validated using the tasks table
• Drizzle Studio loads schema correctly with direct DB URL
• ESLint passes and auto-sorts imports

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Notes / Follow-ups

• The tasks table is temporary and used only for validation
• Upcoming PRs will:
  • replace sample schema with domain-specific models
  • add authentication and validation

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Type of change

• Tooling / infrastructure
• Database setup
• Feature
• Bug fix