feat: upload pre-generated audio and copy to runtime cache on startup

- Generated all 17 paragraphs for Puss in Boots story
- Upload hash-named files to audio_cache/ in Space repo
- Upload story-based named files to pregen_audio/ for reference
- Add startup logic to copy bundled audio_cache/ to runtime AUDIO_CACHE_DIR
(handles HF Space where runtime cache is on /data bucket)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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tts.py

@@ -27,7 +27,7 @@ from collections import OrderedDict
 import numpy as np
 import soundfile as sf
 
-from runtime_config import AUDIO_CACHE_DIR, GPU_INFERENCE_LOCK
+from runtime_config import AUDIO_CACHE_DIR, GPU_INFERENCE_LOCK, APP_ROOT
 
 logger = logging.getLogger(__name__)
 
@@ -42,6 +42,19 @@ _MAX_CHUNK_CHARS = 120
 _CACHE_DIR = str(AUDIO_CACHE_DIR)
 os.makedirs(_CACHE_DIR, exist_ok=True)
 
+# Copy pre-generated audio from app bundle to runtime cache (HF Space: repo → /data)
+_BUNDLED_CACHE = APP_ROOT / "audio_cache"
+if _BUNDLED_CACHE.is_dir() and str(_BUNDLED_CACHE) != _CACHE_DIR:
+    import shutil
+    _copied = 0
+    for _wav in _BUNDLED_CACHE.glob("*.wav"):
+        _dest = os.path.join(_CACHE_DIR, _wav.name)
+        if not os.path.exists(_dest):
+            shutil.copy2(str(_wav), _dest)
+            _copied += 1
+    if _copied:
+        logger.info("Copied %d pre-generated audio files to runtime cache.", _copied)
+
 # Transition chime (soft sine fade, 0.3s at 24kHz)
 _CHIME_SR = 24000
 _CHIME_DURATION = 0.3