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

crates/ghostty-apprt/src/runtime_api.rs

@@ -201,6 +201,15 @@ pub trait CoreSurface {
         data: &str,
         confirmed: bool,
     ) -> Result<(), ClipboardError>;
+    /// [`CoreSurface::complete_clipboard_request`] for a paste of raw bytes
+    /// (Zig data is `[]const u8`). The default converts lossily.
+    fn complete_paste_bytes(&self, data: &[u8], confirmed: bool) -> Result<(), ClipboardError> {
+        self.complete_clipboard_request(
+            ClipboardRequest::Paste,
+            &String::from_utf8_lossy(data),
+            confirmed,
+        )
+    }
     /// After the user confirms (`surface.config.clipboard_read = .allow`).
     fn set_clipboard_read_allowed(&self, allow: bool);
     /// See [`CoreSurface::set_clipboard_read_allowed`] (`clipboard_write`).