* mtmd : deepseek-ocr fixes, improvements and refactoring
- image processing changes to achieve full parity with Pillow (reference impl)
- SAM mask casting only when flash-attn is on
- SAM refactor (build_sam() extracted so deepseek-ocr-2 can reuse it)
- llama-chat changes to fix server/WebUI issue (new media_markers_first())
- adapted test-chat-template and added test cases for deepseek-ocr
- changed regression test for deepseek-ocr to use CER+chrF scores for ground-truth comparison; removed embedding-model
- ty.toml ignore unresolved-import for tools/mtmd/tests/**
* image-text reordering fix removed
* refactor bool add_padding + pad_rounding enum into a single pad_style enum
* update test scripts
* align CI behavior between linux and android
* remove automatically cancel in 15min
* enable cancel-in-progress
* fix ty check issue
* update and fix pylint issue
* update runner such that we are not restricted by the 15min limit rule
* fix flake8 lint issue
* update runner according to review feedback
* code update according to review feedback
* switch from llama-cli to llama-completion binary with -no-cnv flag
* Add the tests that we want to run on external CI
* remove extra files
* Fixes python issues, reove the deadlock on CI
* remove unecessary changes
* use override to ty.toml
* fix pre-commit and try tests with secret in external repo not upstream
* skip if key is unavailable
* Fix feedback
* switch hexagon to snapdragon
* cleanup
* fix secrets
* remove the copyrights at the top of the files
