[0055] 将 s7.c 中的 complex 相关内置函数迁移到 s7_scheme_complex.c

[da-liii]

Summary

• 迁移 g_is_complex（complex? 内置函数）到 s7_scheme_complex.c
• 暴露 s7i_apply_boolean_method 和 s7i_is_complex_symbol 到 s7_internal_helpers.h
• 迁移 OpenBSD/NetBSD 复数反双曲函数备用实现到 s7_scheme_complex.c，并暴露为 s7i_casinh_1、s7i_cacosh_1、s7i_catanh_1
• 更新 s7_scheme_inexact.c 使用 s7i_casinh_1 等函数
• 迁移 C 复数数学辅助函数备用实现到 s7_scheme_complex.c
• 分析并记录 complex_vector 相关函数（g_complex_vector_ref、g_complex_vector_set、g_make_complex_vector 等）因深度耦合 s7.c 共享向量基础设施，保留在 s7.c 中

Test plan

• bin/gf tests/scheme/base/complex-p-test.scm
• bin/gf tests/scheme/complex/angle-test.scm
• bin/gf tests/scheme/complex/imag-part-test.scm
• bin/gf tests/scheme/complex/magnitude-test.scm
• bin/gf tests/scheme/complex/make-polar-test.scm
• bin/gf tests/scheme/complex/make-rectangular-test.scm
• bin/gf tests/scheme/complex/real-part-test.scm
• bin/gf tests/liii/vector/complex-vector-test.scm
• bin/gf tests/liii/vector/complex-vector-p-test.scm
• bin/gf tests/liii/vector/complex-vector-ref-test.scm
• bin/gf tests/liii/vector/complex-vector-set-bang-test.scm
• bin/gf tests/liii/vector/make-complex-vector-test.scm
• bin/gf tests/scheme/inexact/acos-test.scm
• bin/gf tests/scheme/inexact/asin-test.scm
• bin/gf tests/scheme/inexact/cos-test.scm
• bin/gf tests/scheme/inexact/exp-test.scm
• bin/gf tests/scheme/inexact/log-test.scm
• bin/gf tests/scheme/inexact/sin-test.scm
• bin/gf tests/scheme/inexact/sqrt-test.scm
• bin/gf tests/scheme/inexact/tan-test.scm

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