refactor(architecture): enforce component layering constraints

- move runtime policy/diag contracts to domain-owned facade and remove control_plane leapfrog usage

- enforce single declaration point for direct debug config in domain public API (constraint #6)

- harden timeout/idempotent semantics in REST/voice/printer/wifi/ble paths

components/domain/src/system_runtime.c

@@ -1,4 +1,5 @@
 #include "domain.h"
+#include "platform.h"
 
 esp_err_t system_runtime_start(void) {
     esp_err_t err = platform_bootstrap_init();