Web API

[memowe]

• Simple first version
• Add OpenAPI
• Add OpenAPI GUI

Closes #10

[memowe]

At the moment liblzma-dev seems to be missing and thus failing the pipeline

[Copilot]

Pull Request Overview

This PR adds a new REST API server (t4-api) to the terminal time tracking tool, providing read-only access to tracking data with OpenAPI/Swagger documentation support.

• Adds a new executable t4-api that serves a REST API with OpenAPI specification and Swagger UI
• Includes static file serving capability for HTML reports
• Updates CI workflow to install required system dependencies for building the new API server

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
terminal-time-tracking-tool.cabal	Adds t4-api executable configuration with servant dependencies and data-files directive for static assets
exe-t4-api/API.hs	Implements the API server with endpoints for clocks, categories, and tags, plus OpenAPI/Swagger UI integration
exe-t4-api/static/report.html	Adds placeholder HTML file for static content serving
.github/workflows/haskell-ci.yml	Installs liblzma-dev and pkg-config dependencies needed for building new API dependencies

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