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>

scenes/rooms/floor0/Reception.tscn

@@ -0,0 +1,41 @@
+[gd_scene load_steps=2 format=3 uid="uid://cozypaw_reception"]
+
+[ext_resource type="PackedScene" path="res://scenes/objects/InteractiveObject.tscn" id="1_iobj"]
+
+[node name="Reception" type="Node2D"]
+
+[node name="Background" type="ColorRect" parent="."]
+color = Color(0.78, 0.94, 0.80, 1)
+size = Vector2(1280, 720)
+position = Vector2(0, 0)
+
+[node name="Counter" type="ColorRect" parent="."]
+color = Color(0.55, 0.35, 0.18, 1)
+size = Vector2(300, 80)
+position = Vector2(490, 610)
+
+[node name="CounterTop" type="ColorRect" parent="."]
+color = Color(0.70, 0.50, 0.28, 1)
+size = Vector2(300, 12)
+position = Vector2(490, 598)
+
+[node name="Floor" type="ColorRect" parent="."]
+color = Color(0.88, 0.80, 0.68, 1)
+size = Vector2(1280, 100)
+position = Vector2(0, 620)
+
+[node name="WallLeft" type="ColorRect" parent="."]
+color = Color(0.92, 0.88, 0.82, 1)
+size = Vector2(40, 620)
+position = Vector2(0, 0)
+
+[node name="WallRight" type="ColorRect" parent="."]
+color = Color(0.92, 0.88, 0.82, 1)
+size = Vector2(40, 620)
+position = Vector2(1240, 0)
+
+[node name="CharacterSpawn" type="Marker2D" parent="."]
+position = Vector2(300, 520)
+
+[node name="Flower" parent="." instance=ExtResource("1_iobj")]
+position = Vector2(200, 560)