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

config.yaml

@@ -0,0 +1,56 @@
+# ============================================
+# Miku Discord Bot - Configuration
+# ============================================
+# This file contains all non-secret configuration
+# Secrets (API keys, tokens) go in .env
+
+# Service Endpoints
+services:
+  llama:
+    url: http://llama-swap:8080
+    amd_url: http://llama-swap-amd:8080
+  
+  cheshire_cat:
+    url: http://cheshire-cat:80
+    timeout_seconds: 120
+    enabled: true  # Set to false to disable Cheshire Cat integration
+  
+  face_detector:
+    startup_timeout_seconds: 60
+
+# AI Models
+models:
+  text: llama3.1
+  vision: vision
+  evil: darkidol  # Uncensored model for evil mode
+  japanese: swallow  # Llama 3.1 Swallow model for Japanese
+
+# Discord Bot Settings
+discord:
+  language_mode: english  # Options: english, japanese
+  api_port: 3939  # FastAPI server port
+
+# Autonomous System
+autonomous:
+  debug_mode: false  # Enable detailed decision logging
+  # Mood settings can be configured per-server via API
+
+# Voice Chat
+voice:
+  debug_mode: false  # Enable manual commands and notifications
+  # When false (production), voice operates silently
+
+# Memory & Logging
+memory:
+  log_dir: /app/memory/logs
+  conversation_history_length: 5  # Messages to keep per user
+
+# Server Settings
+server:
+  host: 0.0.0.0
+  log_level: critical  # For uvicorn (access logs handled separately)
+
+# GPU Configuration
+gpu:
+  prefer_amd: false  # Prefer AMD GPU over NVIDIA
+  amd_models_enabled: true