feat: add keyboard layout support

template/sysroot/include/Api/Syscall.hpp

@@ -391,6 +391,13 @@ namespace montauk::abi {
         bool    shift;
         bool    ctrl;
         bool    alt;
+        bool    capslock;
+        // Right Alt held, reported separately from alt so keyboard layouts can
+        // use it as AltGr without swallowing left-Alt shortcuts.
+        bool    altgr;
+        // Key came from an E0-prefixed scancode (keypad "/" and Enter share a
+        // scancode with the main-block keys). Layout translation must skip it.
+        bool    extended;
     };
 
     struct MouseState {

template/sysroot/include/libc/montauk.h

@@ -228,6 +228,9 @@ typedef struct {
     uint8_t shift;
     uint8_t ctrl;
     uint8_t alt;
+    uint8_t capslock;
+    uint8_t altgr;
+    uint8_t extended;
 } mtk_key_event;
 
 typedef struct {