deploy: sync code from GitHub main

fix: DAPT model name + remove symlink deprecation

fix(ci): remove legacy LFS model breaking CI checkout

style: apply ruff format to pass CI format check

fix: resolve 63 ruff lint errors failing CI

feat(ml): 3-model ensemble (0.813 Micro-F1) + hybrid LLM tiers + safety override

Add CI/CD pipelines and code quality tooling

Add HF Spaces config, README, and model weights

Initial commit — DepScreen backend