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

readmes/README.md

@@ -28,7 +28,7 @@ Meet **Hatsune Miku** - a fully-featured, AI-powered Discord bot that brings the
 - 💬 **DM Support** - Personal conversations with mood tracking
 - 🐦 **Twitter Integration** - Shares Miku-related tweets and figurine announcements
 - 🎮 **ComfyUI Integration** - Natural language image generation requests
-- 🔊 **Voice Chat Ready** - Fish.audio TTS integration (docs included)
+- 🔊 **Voice Chat Ready** - TTS integration for voice features
 - 📊 **RESTful API** - Full control via HTTP endpoints
 - 🐳 **Production Ready** - Docker Compose with GPU support
 
@@ -418,7 +418,7 @@ All data is stored in `bot/memory/`:
 Detailed documentation available in the `readmes/` directory:
 
 - **[AUTONOMOUS_V2_IMPLEMENTED.md](readmes/AUTONOMOUS_V2_IMPLEMENTED.md)** - Autonomous system V2 details
-- **[VOICE_CHAT_IMPLEMENTATION.md](readmes/VOICE_CHAT_IMPLEMENTATION.md)** - Fish.audio TTS integration guide
+- **[VOICE_CHAT_IMPLEMENTATION.md](readmes/VOICE_CHAT_IMPLEMENTATION.md)** - Voice chat and TTS integration guide
 - **[PROFILE_PICTURE_FEATURE.md](readmes/PROFILE_PICTURE_FEATURE.md)** - Profile picture system
 - **[FACE_DETECTION_API_MIGRATION.md](readmes/FACE_DETECTION_API_MIGRATION.md)** - Face detection setup
 - **[DM_ANALYSIS_FEATURE.md](readmes/DM_ANALYSIS_FEATURE.md)** - DM interaction analytics