Implement comprehensive LLM provider system with global cost protection

- Add multi-provider LLM architecture supporting OpenRouter, OpenAI, Gemini, and custom providers
- Implement global LLM on/off switch with default DISABLED state for cost protection
- Add per-character LLM configuration with provider-specific models and settings
- Create performance-optimized caching system for LLM enabled status checks
- Add API key validation before enabling LLM providers to prevent broken configurations
- Implement audit logging for all LLM enable/disable actions for cost accountability
- Create comprehensive admin UI with prominent cost warnings and confirmation dialogs
- Add visual indicators in character list for custom AI model configurations
- Build character-specific LLM client system with global fallback mechanism
- Add database schema support for per-character LLM settings
- Implement graceful fallback responses when LLM is globally disabled
- Create provider testing and validation system for reliable connections

config/llm_providers_example.yaml

@@ -0,0 +1,79 @@
+# Example LLM Provider Configuration
+# Copy this section to your main fishbowl_config.json under "llm" -> "providers"
+
+llm:
+  # Legacy config (still supported for backwards compatibility)
+  base_url: "${LLM_BASE_URL:http://localhost:11434}"
+  model: "${LLM_MODEL:llama2}"
+  timeout: ${LLM_TIMEOUT:300}
+  max_tokens: ${LLM_MAX_TOKENS:2000}
+  temperature: ${LLM_TEMPERATURE:0.8}
+  
+  # New multi-provider configuration
+  providers:
+    # OpenRouter (supports many models including Claude, GPT, Llama)
+    openrouter:
+      type: "openrouter"
+      enabled: ${OPENROUTER_ENABLED:false}
+      priority: 100  # Highest priority
+      config:
+        api_key: "${OPENROUTER_API_KEY:}"
+        base_url: "https://openrouter.ai/api/v1"
+        model: "${OPENROUTER_MODEL:anthropic/claude-3-sonnet}"
+        timeout: 300
+        max_tokens: 2000
+        temperature: 0.8
+        app_name: "discord-fishbowl"
+    
+    # OpenAI
+    openai:
+      type: "openai"
+      enabled: ${OPENAI_ENABLED:false}
+      priority: 90
+      config:
+        api_key: "${OPENAI_API_KEY:}"
+        base_url: "https://api.openai.com/v1"
+        model: "${OPENAI_MODEL:gpt-4o-mini}"
+        timeout: 300
+        max_tokens: 2000
+        temperature: 0.8
+    
+    # Google Gemini
+    gemini:
+      type: "gemini"
+      enabled: ${GEMINI_ENABLED:false}
+      priority: 80
+      config:
+        api_key: "${GEMINI_API_KEY:}"
+        base_url: "https://generativelanguage.googleapis.com/v1beta"
+        model: "${GEMINI_MODEL:gemini-1.5-flash}"
+        timeout: 300
+        max_tokens: 2000
+        temperature: 0.8
+    
+    # Custom/Local (KoboldCPP, Ollama, etc.)
+    custom:
+      type: "custom"
+      enabled: ${CUSTOM_LLM_ENABLED:true}
+      priority: 70  # Lower priority - fallback
+      config:
+        base_url: "${LLM_BASE_URL:http://192.168.1.200:5005/v1}"
+        model: "${LLM_MODEL:koboldcpp/Broken-Tutu-24B-Transgression-v2.0.i1-Q4_K_M}"
+        api_key: "${LLM_API_KEY:x}"
+        timeout: 300
+        max_tokens: 2000
+        temperature: 0.8
+        api_format: "openai"  # or "ollama"
+    
+    # Ollama (local models)
+    ollama:
+      type: "custom"
+      enabled: ${OLLAMA_ENABLED:false}
+      priority: 60
+      config:
+        base_url: "http://localhost:11434"
+        model: "${OLLAMA_MODEL:llama3}"
+        timeout: 300
+        max_tokens: 2000
+        temperature: 0.8
+        api_format: "ollama"