[myai] feat(myai): switch to Qwen2.5-Coder-1.5B (local GPU, ~30s/64tok)

Commit f9ceaed

Description

Replace StarCoder2-3B with Qwen/Qwen2.5-Coder-1.5B:

• 1.5B params → ~3GB float16 → fits entirely in T400 4GB VRAM
• No CPU offloading → ~30s/64tok vs 3-7min before
• safetensors format → compatible with PyTorch 2.2 + transformers 4.57
• Not gated → no HF token needed for download

Removed hf_token secret dependency, restored GPU placement constraint, adjusted resource limits to 2CPU/3G RAM.

Co-Authored-By: Claude Sonnet 4.6 noreply@anthropic.com

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