fix: preserve non-UTF-8 bytes in OS, config and CLI layers

Zig treats paths, arguments and environment values as byte slices; the
port converted them lossily in many places. Now (final-Z1.md):
- argv, env (incl. present non-UTF-8 values), HOME, PATH lookup,
  passwd, resources dir, TMPDIR, cgroup, config path canonicalization,
  +validate-config, +list-themes and Zig-string escapes (\xFF) keep raw
  bytes. String-based config values carry bytes via ghostty_os::osbytes,
  a bijective escape (noncharacter U+FDD0 + byte) that leaves all valid
  UTF-8 - including Nerd Font private-use icons - unchanged.
- os/file rlimit fallbacks exist on all targets.
- i18n locale canonicalization is an exact port of libintl's tables
  (e.g. pa-Guru -> pa_IN).
- New ghostty-build-info crate is the single source of version, channel,
  commit and build mode for all consumers.

Test Plan:
- cargo test -p ghostty-os -p ghostty-config -p ghostty-cli
  (incl. randomized osbytes round-trip property tests)

crates/ghostty-cli/src/action.rs

@@ -53,7 +53,7 @@ pub trait ActionEnum: Sized + Copy {
 
 /// Detect the action from the process CLI args (Zig: `detectArgs`).
 pub fn detect_args<E: ActionEnum>() -> Result<Option<E>, DetectError> {
-    detect_iter(ghostty_os::args::collect_lossy())
+    detect_iter(ghostty_os::args::collect_config_strings())
 }
 
 /// Detect the action from any iterator. Each iterator value should yield