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>

crates/apps/shturman-splash/Cargo.toml

@@ -0,0 +1,16 @@
+[package]
+name = "shturman-splash"
+version = "0.0.0"
+edition.workspace = true
+license.workspace = true
+
+[dependencies]
+shturman-render = { path = "../shturman-render" }
+shturman-common = { path = "../../shturman-common" }
+anyhow.workspace = true
+tracing.workspace = true
+slint.workspace = true
+
+[dev-dependencies]
+tempfile.workspace = true
+png = "0.17"