fix(config): persist runtime settings across bot restarts

Add restore_runtime_settings() to ConfigManager that reads config_runtime.yaml
on startup and restores persisted values into globals:
- LANGUAGE_MODE, AUTONOMOUS_DEBUG, VOICE_DEBUG_MODE
- USE_CHESHIRE_CAT, PREFER_AMD_GPU, DM_MOOD

Add missing persistence calls to API endpoints:
- POST /language/set now persists to config_runtime.yaml
- POST /voice/debug-mode now persists to config_runtime.yaml
- POST /memory/toggle now persists to config_runtime.yaml

Call restore_runtime_settings() in on_ready() after evil/bipolar restore.

Resolves #22

bot/api.py

@@ -307,6 +307,13 @@ def set_language_mode(language: str = "english"):
     model_used = globals.JAPANESE_TEXT_MODEL if language.lower() == "japanese" else globals.TEXT_MODEL
     logger.info(f"Language mode set to {language.lower()} (using {model_used})")
     
+    # Persist so it survives restarts
+    try:
+        from config_manager import config_manager
+        config_manager.set("discord.language_mode", language.lower(), persist=True)
+    except Exception:
+        pass
+    
     return {
         "status": "ok",
         "language_mode": language.lower(),
@@ -2963,6 +2970,14 @@ def set_voice_debug_mode(enabled: bool = Form(...)):
     """Set voice debug mode (shows transcriptions and responses in text channel)"""
     globals.VOICE_DEBUG_MODE = enabled
     logger.info(f"Voice debug mode set to: {enabled}")
+    
+    # Persist so it survives restarts
+    try:
+        from config_manager import config_manager
+        config_manager.set("voice.debug_mode", enabled, persist=True)
+    except Exception:
+        pass
+    
     return {
         "status": "ok",
         "debug_mode": enabled,
@@ -3004,6 +3019,14 @@ async def toggle_cat_integration(enabled: bool = Form(...)):
     """Toggle Cheshire Cat integration on/off."""
     globals.USE_CHESHIRE_CAT = enabled
     logger.info(f"🐱 Cheshire Cat integration {'ENABLED' if enabled else 'DISABLED'}")
+    
+    # Persist so it survives restarts
+    try:
+        from config_manager import config_manager
+        config_manager.set("memory.use_cheshire_cat", enabled, persist=True)
+    except Exception:
+        pass
+    
     return {
         "success": True,
         "enabled": globals.USE_CHESHIRE_CAT,