chore: smaller image size

[ConnorNeed]

Cuts image size down from 2.7G to around 500M

[Copilot]

Pull request overview

This PR reduces the resulting Docker image size by switching the Next.js build to standalone output and moving to a multi-stage Docker build that copies only the standalone runtime artifacts into the final image.

Changes:

• Enable Next.js output: "standalone" to generate a minimal runtime bundle.
• Convert the Docker build to multi-stage (builder + runner) and run the app via node server.js.
• Add a .dockerignore to keep build context small and avoid copying unnecessary directories into the build.

Reviewed changes

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

File	Description
next.config.ts	Enables Next.js standalone output for smaller runtime packaging.
Dockerfile	Switches to multi-stage build and copies only standalone artifacts into the final image.
.dockerignore	Excludes common large/unnecessary directories from the Docker build context.

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