Add player health, lives, death, and cutscene system

Added player damage, invulnerability frames, knockback, and death handling. Enemies stop attacking after player death and player controls are disabled. Added a persistent three-life system with ambulance cutscenes after the first two deaths and a final Game Over cutscene after the third death.

Assets/Cut Scenes/Calendar Cutscene.ogv.uid

@@ -0,0 +1 @@
+uid://bbi3yd8miilul

Assets/Cut Scenes/Game over video.ogv.uid

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+uid://b41725daretoj

Assets/Cut Scenes/Weewoo.ogv.uid

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+uid://l34f82rsegd6