Bump cocoindex-rs version to 0.1.15

Refactor cocoindex-rs into single-process MCP

fix: avoid temp_dir unbound variable in installer

feat: consolidate cocoindex, cocoindex-go, and cocoindex-rs into monorepo

fix: bring down daemon in more reliable way (#68)

feat: preliminary implementation for daemon + CLI (#67)

chore: make sure `pytest` always run in precommit (#64)

refactor: create separate `Project` to encapsulate `coco.Environment` (#63)

chore: upgrade cocoindex and fix args to `embed()` call (#61)

chore: clarify `sbert/` for local models & simplify `trust_remote_code` (#60)

chore: reformat (#59)

Feat/excluded patterns (#54)

feat: add Lua language support (#57)

chore: upgrade cocoindex dependency version (#55)

fix: use `SentenceTransformer` to automatically choose device (#50)