fix(core): Add explicit template instantiation for World constructor

Resolves linker errors across all CI builds by adding explicit instantiation
of World<CartesianTag> constructor. Template implementations in .cpp files
require explicit instantiation to be visible to other translation units.

The constructor was implemented (lines 33-42) but lacked the explicit
instantiation declaration, causing undefined reference errors at link time
in gcc-11, gcc-13, clang-14, clang-16 Release and Debug builds.

Also fixes clang-format violations in tungsten_input.hpp for Nix build.
Reformats ParameterMetadata builder chains to meet project style.

Fixes: undefined reference to 'pfc::world::World<CartesianTag>::World(...)'
Fixes: 50+ clang-format violations in Nix build (exit code 281)

Author: ahojukka5