assets(audio): replace all placeholder SFX and music with real CC0 audio

All 22 placeholder 0-byte OGG files replaced with freesound.org previews
(128 kbps HQ OGG). All tracks are CC0. Includes Godot import sidecar files
(.ogg.import) for 11 files that had none previously.

Sprints 19, 21, 22 audio coverage complete.

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

assets/audio/music/floor_0.ogg.import

@@ -0,0 +1,18 @@
+[remap]
+
+importer="oggvorbisstr"
+type="AudioStreamOggVorbis"
+uid="uid://dgcrrb572igsv"
+valid=false
+
+[deps]
+
+source_file="res://assets/audio/music/floor_0.ogg"
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4

assets/audio/music/floor_1.ogg.import

@@ -0,0 +1,18 @@
+[remap]
+
+importer="oggvorbisstr"
+type="AudioStreamOggVorbis"
+uid="uid://5e2h06ahgper"
+valid=false
+
+[deps]
+
+source_file="res://assets/audio/music/floor_1.ogg"
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4

assets/audio/music/floor_2.ogg.import

@@ -0,0 +1,18 @@
+[remap]
+
+importer="oggvorbisstr"
+type="AudioStreamOggVorbis"
+uid="uid://ddia1ses0471i"
+valid=false
+
+[deps]
+
+source_file="res://assets/audio/music/floor_2.ogg"
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4

assets/audio/music/floor_3.ogg.import

@@ -0,0 +1,18 @@
+[remap]
+
+importer="oggvorbisstr"
+type="AudioStreamOggVorbis"
+uid="uid://hswbjuc6exdq"
+valid=false
+
+[deps]
+
+source_file="res://assets/audio/music/floor_3.ogg"
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4

assets/audio/sfx/chest_tap.ogg.import

@@ -0,0 +1,18 @@
+[remap]
+
+importer="oggvorbisstr"
+type="AudioStreamOggVorbis"
+uid="uid://clhj71pir50qn"
+valid=false
+
+[deps]
+
+source_file="res://assets/audio/sfx/chest_tap.ogg"
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4

assets/audio/sfx/item_drag_start.ogg.import

@@ -0,0 +1,18 @@
+[remap]
+
+importer="oggvorbisstr"
+type="AudioStreamOggVorbis"
+uid="uid://c8ejoka50o3yr"
+valid=false
+
+[deps]
+
+source_file="res://assets/audio/sfx/item_drag_start.ogg"
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4

assets/audio/sfx/item_drop_floor.ogg.import

@@ -0,0 +1,18 @@
+[remap]
+
+importer="oggvorbisstr"
+type="AudioStreamOggVorbis"
+uid="uid://cv8mj3nk04dov"
+valid=false
+
+[deps]
+
+source_file="res://assets/audio/sfx/item_drop_floor.ogg"
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4

assets/audio/sfx/item_drop_hand.ogg.import

@@ -0,0 +1,18 @@
+[remap]
+
+importer="oggvorbisstr"
+type="AudioStreamOggVorbis"
+uid="uid://c3hooek70n7dq"
+valid=false
+
+[deps]
+
+source_file="res://assets/audio/sfx/item_drop_hand.ogg"
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4

assets/audio/sfx/item_drop_outfit.ogg.import

@@ -0,0 +1,18 @@
+[remap]
+
+importer="oggvorbisstr"
+type="AudioStreamOggVorbis"
+uid="uid://db5cgjn6svke4"
+valid=false
+
+[deps]
+
+source_file="res://assets/audio/sfx/item_drop_outfit.ogg"
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4

assets/audio/sfx/item_return_chest.ogg.import

@@ -0,0 +1,18 @@
+[remap]
+
+importer="oggvorbisstr"
+type="AudioStreamOggVorbis"
+uid="uid://c7t2tdceav7ms"
+valid=false
+
+[deps]
+
+source_file="res://assets/audio/sfx/item_return_chest.ogg"
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4

assets/audio/sfx/item_spawn.ogg.import

@@ -0,0 +1,18 @@
+[remap]
+
+importer="oggvorbisstr"
+type="AudioStreamOggVorbis"
+uid="uid://bu26y0klq2pn5"
+valid=false
+
+[deps]
+
+source_file="res://assets/audio/sfx/item_spawn.ogg"
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4