Define SOL_TCP and SOL_UDP for WASIp1

[Hokila]

Summary

• define SOL_TCP and SOL_UDP for the WASIp1 <sys/socket.h> path
• add compile-time assertions for the socket-level values
• register the regression test across supported WASI targets

Fixes #855.

Testing

• verified the new WASIp1 assertion test fails before the header change because both constants are undeclared
• verified the same WASIp1 syntax-only compilation succeeds after the header change
• git diff --check

Environment limitations

• cargo test --manifest-path tools/wasi-headers/Cargo.toml reaches the existing assert_same_as_src test but fails because the checked-in wasi/api.h already differs from the generator output
• the full local CMake target is blocked by Apple ar rejecting the project's empty archive command
• WASIp2/WASIp3 CMake configuration requires Clang 22+, while this host provides Apple Clang 21; their source branch is unchanged by this patch