feat(v0.2): shturman-splash — Stage-0 splash (software-render → PNG)

P6.2: статичный брендовый splash-кадр (wordmark «Штурман» на тёмном),
render_splash через shturman-render; bin с --screenshot. Без чтения шины
(стартует до Power/Settings → «мгновенно»). Визуальные токены — каркас (язык v0.5).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Signed-off-by: Alexander <akotenev2003@gmail.com>

Cargo.toml

@@ -10,6 +10,7 @@ members = [
     "crates/core/shturman-settings",
     "crates/core/shturman-power",
     "crates/apps/shturman-render",
+    "crates/apps/shturman-splash",
     "crates/apps/shturman-shell",
     "crates/tools/shturman-manifest-validator",
 ]