Add macOS support (Steam auth + OpenSSL/TLS)

[ChronoFinale]

Adds macOS support for the two FFI-based features. Windows/Linux behavior is unchanged.

Steam auth tickets

steam.lua resolved Steam's flat API only via Win32 GetModuleHandleA/GetProcAddress. This adds a dlopen/dlsym path for macOS/Linux (the Win32 path is kept under ffi.os == 'Windows'). It resolves symbols from the game's already-loaded Steam library (libsteam_api.dylib), which is universal, so this is arch-agnostic.

OpenSSL / TLS

openssl_ffi.lua is now platform-aware. On macOS a bare-name load (libssl.dylib) resolves to Apple's deprecated /usr/lib LibreSSL and aborts the process ("loading libcrypto in an unsafe way", Abort trap: 6). So on macOS we load bundled OpenSSL 3 dylibs by absolute path.

Because OpenSSL is loaded inside the MQTT worker thread — a separate Lua state with no MPAPI and a different CWD — the mod's networking/ directory is recovered from package.path (which core.lua already populates and which is forwarded to the worker), rather than from a global. The two load loops were also deduplicated into a single helper.

Native libraries (not committed)

libssl.3.dylib + libcrypto.3.dylib are not in this PR. They should ship as a release asset (or via Git LFS) placed in networking/:

• universal (x86_64 + arm64) — Intel + Apple Silicon
• OpenSSL 3.6.2, built from Homebrew bottles with minos 14.0 (loads on macOS 14 / 15 / 26)
• relinked with @loader_path (no Homebrew dependency) and ad-hoc signed (matching liblovely.dylib / luasteam.so, which are also ad-hoc)

Testing

Verified on an M2 (arm64) MacBook, macOS 26: joined a lobby, played a full match, and Steam login worked. The x86_64 slice is built from the official Homebrew Intel bottle but has not been runtime-tested (no Intel hardware available).

[ChronoFinale]

macOS native libraries (kept out of the tree to avoid committing ~12 MB of binaries):

Unzip the attached archive and drop libssl.3.dylib + libcrypto.3.dylib into networking/ (next to openssl_ffi.lua). The loader derives that directory from package.path, so that's where it looks.

Details:

• Universal (x86_64 + arm64) — Intel + Apple Silicon
• OpenSSL 3.6.2, minos 14.0 → loads on macOS 14 / 15 / 26
• @loader_path-linked (no Homebrew dependency) and ad-hoc signed (same posture as liblovely.dylib / luasteam.so)

(zip attached below)

[ChronoFinale]

openssl-macos-universal.zip