feat(power): Power1 стаб + dev-mock fake-ACC (feature dev-mocks)

PowerService (Power1, стаб running) + PowerMock (dev.PowerMock1, разделяет State через Arc<Mutex>).
dev-mocks — default-фича; прод (--no-default-features) mock не регистрирует.

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

Cargo.toml

@@ -8,6 +8,7 @@ members = [
     "crates/shturman-sdk",
     "crates/core/shturman-firstboot",
     "crates/core/shturman-settings",
+    "crates/core/shturman-power",
 ]
 
 [workspace.package]