Phase 1: Setup project structure and tool installation guide

- Created project directory structure
- Added docs/SETUP_PHASE1.md with tool installation instructions
- Added docs/AUDIO_ANALYSIS.md with game audio architecture
- Added src/HomuraHimeAudioMod/ BepInEx plugin skeleton
- Added patch stubs for VoiceManager, AudioDucking, EnemyAudio
- Configured .gitignore for build artifacts and game files
- Initialized beads issue tracker

.gitignore

@@ -1,4 +1,38 @@
-
 # Dolt database files (added by bd init)
 .dolt/
 *.db
+
+# Build outputs
+bin/
+obj/
+*.dll
+*.pdb
+*.mdb
+
+# IDE
+.vs/
+.vscode/
+*.user
+*.suo
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Game files (should not be in repo)
+# Uncomment if you want to track modified game files
+# HomuraHime_Data/
+
+# BepInEx (runtime generated)
+BepInEx/logs/
+BepInEx/cache/
+BepInEx/config/
+
+# FMOD Studio
+*.cache
+*~
+
+# Temporary files
+*.tmp
+*.bak
+*.swp