updated documentation

[rc:fix] fixed mock warnings

[rc:fix] failing tests (mocking services)

[rc:feat] added static api key for production deploy

[rc:clean] clean actual working code and introduced tests

[rc:fix] fastapi_poe don't support image generation, so i got a crappy workaround

[rc:fix] refactored image models

[rc:feat] add more models with image generation and attachment inputs

[rc:infra] init repo with base structure