feat: Implement comprehensive non-hierarchical logging system

- Created new logging infrastructure with per-component filtering
- Added 6 log levels: DEBUG, INFO, API, WARNING, ERROR, CRITICAL
- Implemented non-hierarchical level control (any combination can be enabled)
- Migrated 917 print() statements across 31 files to structured logging
- Created web UI (system.html) for runtime configuration with dark theme
- Added global level controls to enable/disable levels across all components
- Added timestamp format control (off/time/date/datetime options)
- Implemented log rotation (10MB per file, 5 backups)
- Added API endpoints for dynamic log configuration
- Configured HTTP request logging with filtering via api.requests component
- Intercepted APScheduler logs with proper formatting
- Fixed persistence paths to use /app/memory for Docker volume compatibility
- Fixed checkbox display bug in web UI (enabled_levels now properly shown)
- Changed System Settings button to open in same tab instead of new window

Components: bot, api, api.requests, autonomous, persona, vision, llm,
conversation, mood, dm, scheduled, gpu, media, server, commands,
sentiment, core, apscheduler

All settings persist across container restarts via JSON config.

bot/utils/context_manager.py

@@ -5,13 +5,18 @@ Replaces the vector search system with organized, complete context.
 Preserves original content files in their entirety.
 """
 
+from utils.logger import get_logger
+
+logger = get_logger('core')
+
+
 def get_original_miku_lore() -> str:
     """Load the complete, unmodified miku_lore.txt file"""
     try:
         with open("miku_lore.txt", "r", encoding="utf-8") as f:
             return f.read()
     except Exception as e:
-        print(f"⚠️ Failed to load miku_lore.txt: {e}")
+        logger.error(f"Failed to load miku_lore.txt: {e}")
         return "## MIKU LORE\n[File could not be loaded]"
 
 
@@ -21,7 +26,7 @@ def get_original_miku_prompt() -> str:
         with open("miku_prompt.txt", "r", encoding="utf-8") as f:
             return f.read()
     except Exception as e:
-        print(f"⚠️ Failed to load miku_prompt.txt: {e}")
+        logger.error(f"Failed to load miku_prompt.txt: {e}")
         return "## MIKU PROMPT\n[File could not be loaded]"
 
 
@@ -31,7 +36,7 @@ def get_original_miku_lyrics() -> str:
         with open("miku_lyrics.txt", "r", encoding="utf-8") as f:
             return f.read()
     except Exception as e:
-        print(f"⚠️ Failed to load miku_lyrics.txt: {e}")
+        logger.error(f"Failed to load miku_lyrics.txt: {e}")
         return "## MIKU LYRICS\n[File could not be loaded]"