fix: Windows core build, embedded init, byte-exact paths, version info

Closes the remaining core/lib/termio/GTK rows (final-Z2.md):
- ghostty-core compiles for Windows (Unix-only exec fields and file
  modes gated); checked with cargo check --target x86_64-pc-windows-gnu.
- Embedded init: ensure_locale, SIGPIPE ignored in ghostty_init for
  C/Swift hosts, Apple crash tags; the argv passed to ghostty_init feeds
  ghostty_config_load_cli_args; ghostty_config_load_file accepts
  non-UTF-8 paths.
- OSC 7 pwd, embedded surface cwd/command/env/initial input,
  ghostty_surface_text and GTK file drops keep raw bytes.
- XTVERSION, TERM_PROGRAM_VERSION, the About dialog and crash metadata
  use ghostty_build_info instead of hardcoded versions.

Test Plan:
- cargo test --workspace (3327 passed)
- cargo clippy --workspace --all-targets -- -D warnings

Cargo.toml

@@ -62,6 +62,7 @@ ghostty-core = { path = "crates/ghostty-core" }
 ghostty-apprt-gtk = { path = "crates/ghostty-apprt-gtk" }
 ghostty-apprt = { path = "crates/ghostty-apprt" }
 ghostty-cli = { path = "crates/ghostty-cli" }
+ghostty-build-info = { path = "crates/ghostty-build-info" }
 ghostty-crash = { path = "crates/ghostty-crash" }
 ghostty-bench = { path = "crates/ghostty-bench" }
 ghostty-inspector = { path = "crates/ghostty-inspector" }
@@ -119,3 +120,6 @@ overflow-checks = false
 lto = true
 incremental = false
 codegen-units = 1
+
+[build-dependencies]
+embed-resource = "3.0.12"