Add Gemma 3 4B training notebook (Unsloth + QLoRA)

Fix Gemma 4 Colab: auto-restart + trust_remote_code

Fix: install transformers from source for gemma4 support

Add Gemma 4 E2B training notebook

Upload train_on_colab.ipynb with huggingface_hub

Upload folder using huggingface_hub

initial commit