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/adapters/display-terminal/src/lib.rs

@@ -0,0 +1,38 @@
+use client_domain::{BoundingBox, DisplayPort};
+
+pub struct TerminalDisplay;
+
+impl TerminalDisplay {
+    pub fn new() -> Self {
+        Self
+    }
+}
+
+impl DisplayPort for TerminalDisplay {
+    type Error = std::io::Error;
+
+    fn clear_region(&mut self, bounds: BoundingBox) -> Result<(), Self::Error> {
+        println!("[CLEAR] ({}, {}) {}x{}", bounds.x, bounds.y, bounds.width, bounds.height);
+        Ok(())
+    }
+
+    fn draw_text(&mut self, text: &str, x: u16, y: u16, bounds: BoundingBox) -> Result<(), Self::Error> {
+        println!("[TEXT]  ({x}, {y}) in {}x{}: \"{text}\"", bounds.width, bounds.height);
+        Ok(())
+    }
+
+    fn draw_icon(&mut self, icon: &str, x: u16, y: u16) -> Result<(), Self::Error> {
+        println!("[ICON]  ({x}, {y}): {icon}");
+        Ok(())
+    }
+
+    fn fill_background(&mut self, bounds: BoundingBox) -> Result<(), Self::Error> {
+        println!("[BG]   ({}, {}) {}x{}", bounds.x, bounds.y, bounds.width, bounds.height);
+        Ok(())
+    }
+
+    fn flush(&mut self) -> Result<(), Self::Error> {
+        println!("[FLUSH]");
+        Ok(())
+    }
+}