Some fixes / Added tests / Refactor / Package bumps

What's Changed

• Bump @typescript-eslint/eslint-plugin from 8.14.0 to 8.15.0 by @dependabot in #58
• Bump typescript from 5.6.3 to 5.7.2 by @dependabot in #56
• Bump @typescript-eslint/parser from 8.14.0 to 8.15.0 by @dependabot in #55
• Use typescript-eslint recommended rules by @sakowicz in #60
• Add jest and first unit test by @sakowicz in #61
• Add llm-model-factory.test.ts by @sakowicz in #62
• Rename class / Make method not static / Use DI by @sakowicz in #63
• More tests by @sakowicz in #64
• Bump @ai-sdk/google from 1.0.3 to 1.0.4 by @dependabot in #66
• Bump @typescript-eslint/parser from 8.15.0 to 8.16.0 by @dependabot in #67
• Bump @ai-sdk/openai from 1.0.4 to 1.0.5 by @dependabot in #68
• Bump @typescript-eslint/eslint-plugin from 8.15.0 to 8.16.0 by @dependabot in #69
• Bump ai package to the latest version / use generateText directly / F… by @sakowicz in #70

Full Changelog: 1.4.1...1.4.2