refactor: remove QuanticsTCI and QuanticsGrids C API + Julia wrapper

[shinaoka]

Summary

QuanticsTCI / QuanticsGrids の C API と Julia ラッパーを削除する。
TreeTCI + QuanticsGrids.jl (pure Julia) で代替可能。

Scope

tensor4all-rs (C API)

• Delete crates/tensor4all-capi/src/quanticstci.rs + tests
• Delete crates/tensor4all-capi/src/quanticsgrids.rs + tests
• Remove t4a_qtci_f64, t4a_qgrid_disc, t4a_qgrid_int, t4a_linop from types.rs
• Remove quanticstci, quanticsgrids, quanticstransform modules from lib.rs
• Remove deps from Cargo.toml

Tensor4all.jl (Julia)

• Delete src/QuanticsTCI.jl, src/QuanticsGrids.jl, src/QuanticsTransform.jl
• Remove includes from src/Tensor4all.jl
• Remove related C_API.jl wrappers

C API naming cleanup

• t4a_quanticscrossinterpolate_* → already to be deleted