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/characters/character.gd

@@ -0,0 +1,28 @@
+## Character — base class for all playable figures (bunny, cat, etc.).
+class_name Character extends Node2D
+
+signal character_picked_up(character: Character)
+signal character_placed(character: Character, position: Vector2)
+
+@export var character_id: String = ""
+@export var display_name: String = ""
+
+var _is_held: bool = false
+
+
+func _ready() -> void:
+	var drag: DragDropComponent = get_node_or_null("DragDropComponent") as DragDropComponent
+	if drag != null:
+		drag.drag_picked_up.connect(_on_drag_picked_up)
+		drag.drag_released.connect(_on_drag_released)
+
+
+func _on_drag_picked_up(_pos: Vector2) -> void:
+	_is_held = true
+	character_picked_up.emit(self)
+
+
+func _on_drag_released(pos: Vector2) -> void:
+	_is_held = false
+	GameState.set_character_position(character_id, global_position)
+	character_placed.emit(self, pos)