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/ports/mod.rs

@@ -0,0 +1,9 @@
+mod config_repository;
+mod data_source_port;
+mod broadcast;
+mod event;
+
+pub use config_repository::ConfigRepository;
+pub use data_source_port::DataSourcePort;
+pub use broadcast::BroadcastPort;
+pub use event::EventPublisher;