chore: remove all VectorBT references — raptorbt stands on its own
- README: remove VectorBT Comparison section and TOC entry, rewrite
Overview/Performance as standalone benchmarks, clean metric-mapping
table reference, update feature list to 7 strategy types including tick
- Cargo.toml / pyproject.toml: rewrite description without VectorBT mention
- __init__.py: rewrite module docstring without comparative framing
- Rust comments (engine.rs, position.rs, signals/processor.rs, core/types.rs,
python/bindings.rs): replace "matching VectorBT behavior/formula/methodology"
with plain descriptions of what the code does
Co-Authored-By: porcelaincode <contact@alphabench.in>
