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

src/HomuraHimeAudioMod/Plugin.cs

@@ -0,0 +1,47 @@
+using BepInEx;
+using BepInEx.Logging;
+using HarmonyLib;
+
+namespace HomuraHimeAudioMod
+{
+    [BepInPlugin(PluginInfo.PLUGIN_GUID, PluginInfo.PLUGIN_NAME, PluginInfo.PLUGIN_VERSION)]
+    public class Plugin : BaseUnityPlugin
+    {
+        public const string PLUGIN_GUID = "com.homurahime.audiomod";
+        public const string PLUGIN_NAME = "HomuraHime Audio Mod";
+        public const string PLUGIN_VERSION = "1.0.0";
+
+        private static Plugin instance;
+        private static ManualLogSource logger;
+        private Harmony harmony;
+
+        public static ManualLogSource Log => logger;
+
+        private void Awake()
+        {
+            instance = this;
+            logger = Logger;
+            
+            harmony = new Harmony(PluginInfo.PLUGIN_GUID);
+
+            ApplyPatches();
+        }
+
+        private void ApplyPatches()
+        {
+            Log.LogInfo($"Applying audio patches...");
+
+            // Phase 2 will populate these patch classes after code analysis
+            // VoiceManagerPatch.Apply(ref harmony);
+            // AudioDuckingPatch.Apply(ref harmony);
+            // EnemyAudioPatch.Apply(ref harmony);
+
+            Log.LogInfo($"Patches applied successfully");
+        }
+
+        private void OnDestroy()
+        {
+            harmony?.UnpatchAll();
+        }
+    }
+}