feat: Generate types and add testing

[wilburhimself]

This PR implements the following:

• Generates Prisma client and types for both development (PostgreSQL) and testing (SQLite).
• Adds a separate Prisma schema for testing.
• Configures the test script to generate the test client and run tests against the test database.
• Adds an integration test to verify the test database connection.

This completes the 'Generate types' and 'Testing' steps of the project roadmap.

[Copilot]

Pull Request Overview

This PR sets up Prisma type generation and testing infrastructure by implementing separate database configurations for development and testing environments. The implementation creates a dual-client approach with PostgreSQL for development and SQLite for testing.

• Adds a dedicated test Prisma schema using SQLite with a separate client output path
• Updates package.json to include Prisma dependencies and test generation scripts
• Creates an integration test to verify database connectivity using the test client

Reviewed Changes

Copilot reviewed 3 out of 5 changed files in this pull request and generated no comments.

File	Description
prisma/test.prisma	Adds SQLite-based Prisma schema for testing with separate client generation
package.json	Updates dependencies and scripts to support Prisma type generation and test database
src/lib/database.test.ts	Adds integration test for database connectivity verification

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