refactored(tensor): vectorize element-wise addition and scalar scaling using AVX/SSE

- Added SIMD vectorization support (`__AVX__` and `__SSE__`) for element-wise `add`, `add_inplace`, and `scale` operations.
- Maintained scalar fallback paths for non-vectorized bounds and platforms lacking hardware extensions.
- Explicitly defined rule-of-five constructors (`default` and `noexcept` moves) within the `Tensor` struct layout.
- Optimized vector initialization across the core construct layer via `std::move` and `std::vector::reserve`.

Author: Eamon2009