Fix split_lyrics regex to properly detect all lyric segments

- Update regex pattern from \[(\w+)\] to \[([^]]+)\] to handle numbered verses
- Previous pattern only matched CHORUS, missing VERSE 1, VERSE 2, etc.
- Now correctly identifies all segments for proper YuEGP music generation
- Add tests/ to .gitignore to exclude debug scripts

🤖 Generated with [Claude Code](https://claude.ai/code)

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

.gitignore

@@ -106,4 +106,7 @@ transformers_cache/
 flash_attn/
 
 # bcakup files
-packages.txt.backup
+packages.txt.backup
+
+# test files
+tests/

YuEGP/inference/infer.py

@@ -204,7 +204,7 @@ def encode_audio(codec_model, audio_prompt, device, target_bw=0.5):
 
 
 def split_lyrics(lyrics):
-    pattern = r"\[(\w+)\](.*?)\n(?=\[|\Z)"
+    pattern = r"\[([^]]+)\](.*?)(?=\[|\Z)"
     segments = re.findall(pattern, lyrics, re.DOTALL)
     structured_lyrics = [f"[{seg[0]}]\n{seg[1].strip()}\n\n" for seg in segments]
     return structured_lyrics