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/config_manager.py

@@ -102,6 +102,54 @@ class ConfigManager:
         except Exception as e:
             logger.error(f"❌ Failed to load GPU state: {e}")
 
+    def restore_runtime_settings(self):
+        """
+        Restore persisted runtime settings from config_runtime.yaml into globals.
+
+        Called once at startup (in on_ready) so that settings changed via the
+        Web UI or API survive bot restarts.
+
+        Settings with their own persistence (EVIL_MODE, BIPOLAR_MODE) are
+        handled by their respective modules and are intentionally skipped here.
+        """
+        import globals as g
+
+        # Map: config_runtime.yaml key path -> (globals attribute, converter)
+        _SETTINGS_MAP = {
+            "discord.language_mode":    ("LANGUAGE_MODE",     str),
+            "autonomous.debug_mode":    ("AUTONOMOUS_DEBUG",  bool),
+            "voice.debug_mode":         ("VOICE_DEBUG_MODE",  bool),
+            "memory.use_cheshire_cat":  ("USE_CHESHIRE_CAT",  bool),
+            "gpu.prefer_amd":           ("PREFER_AMD_GPU",    bool),
+        }
+
+        restored = []
+
+        for key_path, (attr, converter) in _SETTINGS_MAP.items():
+            value = self._get_nested_value(self.runtime_config, key_path)
+            if value is not None:
+                try:
+                    setattr(g, attr, converter(value))
+                    restored.append(f"{attr}={getattr(g, attr)}")
+                except (ValueError, TypeError) as exc:
+                    logger.warning(f"⚠️  Could not restore {key_path}: {exc}")
+
+        # DM mood needs special handling (load description too)
+        dm_mood = self._get_nested_value(self.runtime_config, "runtime.mood.dm_mood")
+        if dm_mood and isinstance(dm_mood, str) and dm_mood in getattr(g, "AVAILABLE_MOODS", []):
+            g.DM_MOOD = dm_mood
+            try:
+                from utils.moods import load_mood_description
+                g.DM_MOOD_DESCRIPTION = load_mood_description(dm_mood)
+            except Exception:
+                g.DM_MOOD_DESCRIPTION = f"I'm feeling {dm_mood} today."
+            restored.append(f"DM_MOOD={dm_mood}")
+
+        if restored:
+            logger.info(f"🔄 Restored {len(restored)} runtime settings: {', '.join(restored)}")
+        else:
+            logger.debug("ℹ️  No runtime settings to restore")
+
     def get(self, key_path: str, default: Any = None) -> Any:
         """
         Get configuration value with priority system.