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/bot.py

@@ -105,6 +105,10 @@ async def on_ready():
     from utils.bipolar_mode import restore_bipolar_mode_on_startup
     restore_bipolar_mode_on_startup()
 
+    # Restore runtime settings (language, debug flags, etc.) from config_runtime.yaml
+    from config_manager import config_manager
+    config_manager.restore_runtime_settings()
+
     # Initialize DM interaction analyzer
     if globals.OWNER_USER_ID and globals.OWNER_USER_ID != 0:
         init_dm_analyzer(globals.OWNER_USER_ID)