feat(poc): implement Sprint 1 proof of concept

- project.godot with autoload configuration
- Reception room with placeholder visuals
- Draggable Character with DragDropComponent
- Interactive flower object with bounce animation
- GameState, SaveManager, AudioManager, InputManager autoloads
- HUD with back button and music toggle

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scripts/autoload/InputManager.gd

@@ -0,0 +1,30 @@
+## InputManager — abstracts touch and mouse input into unified drag signals.
+extends Node
+
+signal drag_started(position: Vector2)
+signal drag_moved(position: Vector2)
+signal drag_ended(position: Vector2)
+
+var _is_dragging: bool = false
+
+
+func _input(event: InputEvent) -> void:
+	if event is InputEventScreenTouch:
+		if event.pressed:
+			_is_dragging = true
+			drag_started.emit(event.position)
+		else:
+			_is_dragging = false
+			drag_ended.emit(event.position)
+	elif event is InputEventScreenDrag:
+		if _is_dragging:
+			drag_moved.emit(event.position)
+	elif event is InputEventMouseButton and event.button_index == MOUSE_BUTTON_LEFT:
+		if event.pressed:
+			_is_dragging = true
+			drag_started.emit(event.position)
+		else:
+			_is_dragging = false
+			drag_ended.emit(event.position)
+	elif event is InputEventMouseMotion and _is_dragging:
+		drag_moved.emit(event.position)