Implement comprehensive config system and clean up codebase

Major changes:
- Add Pydantic-based configuration system (bot/config.py, bot/config_manager.py)
- Add config.yaml with all service URLs, models, and feature flags
- Fix config.yaml path resolution in Docker (check /app/config.yaml first)
- Remove Fish Audio API integration (tested feature that didn't work)
- Remove hardcoded ERROR_WEBHOOK_URL, import from config instead
- Add missing Pydantic models (LogConfigUpdateRequest, LogFilterUpdateRequest)
- Enable Cheshire Cat memory system by default (USE_CHESHIRE_CAT=true)
- Add .env.example template with all required environment variables
- Add setup.sh script for user-friendly initialization
- Update docker-compose.yml with proper env file mounting
- Update .gitignore for config files and temporary files

Config system features:
- Static configuration from config.yaml
- Runtime overrides from config_runtime.yaml
- Environment variables for secrets (.env)
- Web UI integration via config_manager
- Graceful fallback to defaults

Secrets handling:
- Move ERROR_WEBHOOK_URL from hardcoded to .env
- Add .env.example with all placeholder values
- Document all required secrets
- Fish API key and voice ID removed from .env

Documentation:
- CONFIG_README.md - Configuration system guide
- CONFIG_SYSTEM_COMPLETE.md - Implementation summary
- FISH_API_REMOVAL_COMPLETE.md - Removal record
- SECRETS_CONFIGURED.md - Secrets setup record
- BOT_STARTUP_FIX.md - Pydantic model fixes
- MIGRATION_CHECKLIST.md - Setup checklist
- WEB_UI_INTEGRATION_COMPLETE.md - Web UI config guide
- Updated readmes/README.md with new features

bot/globals.py

@@ -31,17 +31,13 @@ OWNER_USER_ID = int(os.getenv("OWNER_USER_ID", "209381657369772032"))  # Bot own
 
 # Cheshire Cat AI integration (Phase 3)
 CHESHIRE_CAT_URL = os.getenv("CHESHIRE_CAT_URL", "http://cheshire-cat:80")
-USE_CHESHIRE_CAT = os.getenv("USE_CHESHIRE_CAT", "false").lower() == "true"
+USE_CHESHIRE_CAT = os.getenv("USE_CHESHIRE_CAT", "true").lower() == "true"  # Default enabled for memory system
 CHESHIRE_CAT_API_KEY = os.getenv("CHESHIRE_CAT_API_KEY", "")  # Empty = no auth
 CHESHIRE_CAT_TIMEOUT = int(os.getenv("CHESHIRE_CAT_TIMEOUT", "120"))  # Seconds
 
 # Language mode for Miku (english or japanese)
 LANGUAGE_MODE = "english"  # Can be "english" or "japanese"
 
-# Fish.audio TTS settings
-FISH_API_KEY = os.getenv("FISH_API_KEY", "478d263d8c094e0c8993aae3e9cf9159")
-MIKU_VOICE_ID = os.getenv("MIKU_VOICE_ID", "b28b79555e8c4904ac4d048c36e716b7")
-
 # Set up Discord client
 intents = discord.Intents.default()
 intents.message_content = True