rename gauntlet→candy_survival + rewrite Candy Survival per boss design

- Rename enum GAUNTLET→CANDY_SURVIVAL, all gauntlet_*→candy_survival_*
- Rename files: gauntlet_manager→candy_survival_manager, candy_cannon→candy_survival_npc, gauntlet.tscn→candy_survival.tscn
- Rewrite candy_survival_manager.gd: blueprints, candy stack, Mekton delivery, Sugar Rush, knock/ghost charges, sticky-as-wall
- Update player_movement_manager.gd: smack→knock system, ghost integration
- All Candy Survival issues (#54-57, #65-70) retitled per boss design
- Shared managers (goals_cycle, goal, player_race, playerboard, turn) untouched

scripts/controllers/candy_survival_npc_controller.gd

@@ -1,5 +1,5 @@
 extends Node3D
-class_name CandyCannonController
+class_name CandySurvivalNPCController
 
 @export var is_static_turret: bool = true
 
@@ -67,7 +67,7 @@ func spawn_projectile(target_world_pos: Vector3, duration: float) -> void:
 	projectile.mesh = sphere
 	
 	var mat = StandardMaterial3D.new()
-	mat.albedo_color = Color(1.0, 0.4, 0.8) # Candy pink for Gauntlet
+	mat.albedo_color = Color(1.0, 0.4, 0.8) # Candy pink for Candy Survival
 	mat.emission_enabled = true
 	mat.emission = Color(1.0, 0.4, 0.8)
 	mat.emission_energy_multiplier = 3.0