Model card: add proper LTX-2 attribution, license section, commercial-use notice

Add LTX-2 Community License (required by upstream license §3b)

Simplify language support to English only (multilingual release deferred)

Replace DiT with v15 best_step_09700 (LoRA merged, bf16, bit-identical to runtime-LoRA inference)

Upload dramabox-audio-components.safetensors with huggingface_hub

Initial release: Dramabox v1 - Expressive TTS with Voice Cloning