Add key input handling functionality to the agent. Implement API endpoint for sending key presses with support for action types (tap, down, up) and modifiers. Update web interface to allow users to send keys and toggle modifier states through a new interactive element.

lib/models/models.go

@@ -55,3 +55,9 @@ type TextRequest struct {
 	Text    string `json:"text"`
 	DelayMs *int   `json:"delay_ms,omitempty"`
 }
+
+type KeyRequest struct {
+	Key       string   `json:"key"`
+	Action    string   `json:"action"` // tap, down, up
+	Modifiers []string `json:"modifiers,omitempty"`
+}