feat(api): added health check endpoint

[LightJack05]

Closes #8

[Copilot]

Pull request overview

This PR adds a health check endpoint to verify the database connection status. The endpoint returns HTTP 200 if the database is reachable and HTTP 503 if it is not.

Changes:

• Added a new /health endpoint that pings the database
• Created a HealthController in the internal/health package to handle health checks
• Integrated the health check endpoint into the router setup

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
main.go	Added setupHealthCheckEndpoint function and integrated it into the router
internal/health/controller.go	Created HealthController struct with DB client
internal/health/get.go	Implemented Get handler that pings the database and returns appropriate status

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[Copilot]

The GET handler registration is incomplete. The second argument (handler function) is missing. This should instantiate a HealthController and pass its Get method as the handler.

[Copilot]

The setupHealthCheckEndpoint function should accept the database client as a parameter (similar to setupEndpoints) to pass it to the HealthController, since the health check needs to ping the database.