add all crates: domain, protocol, application, client, adapters, ESP32 firmware

Server: domain (entities, value objects, ports), protocol (postcard wire types),
application (config service, data projection), adapters (config-memory, tcp-server),
bootstrap (composition root with fake data).

Client: client-domain (layout engine, render tree, HAL ports),
client-application (message handling, repaint commands),
adapters (tcp-client, display-terminal), client-desktop (end-to-end working).

ESP32: client-esp32 firmware with ILI9341 display over SPI, WiFi networking.
Display test verified on hardware — landscape orientation, text rendering works.

60 workspace tests, all passing.

crates/domain/src/entities/layout_preset.rs

@@ -0,0 +1,10 @@
+use crate::value_objects::Layout;
+
+pub type LayoutPresetId = u16;
+
+#[derive(Debug, Clone)]
+pub struct LayoutPreset {
+    pub id: LayoutPresetId,
+    pub name: String,
+    pub layout: Layout,
+}