feat(domain): add memory module with page pool, per-process tracking, and region table

crates/types/src/address.rs

@@ -7,6 +7,23 @@ pub struct StackPointer(usize);
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub struct VirtualAddress(usize);
 
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
+pub struct PhysicalAddress(usize);
+
+impl PhysicalAddress {
+    pub fn from_raw(addr: usize) -> Self {
+        Self(addr)
+    }
+
+    pub fn raw(&self) -> usize {
+        self.0
+    }
+
+    pub fn offset(&self, pages: usize) -> Self {
+        Self(self.0 + pages * 4096)
+    }
+}
+
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub struct DataRef {
     addr: VirtualAddress,