fix: Multiple bug fixes and improvements

- Fix Invalid Date display in Dashboard notifications
- Fix timezone offset (8 hours) in Trading Records time display
- Fix position closing failures due to commission discrepancies (fetch actual exchange position size for reduce_only orders)
- Fix IBKR connection error 'no current event loop in thread' by ensuring asyncio event loop exists
- Fix duplicate orders on same candle by extending signal deduplication to close signals
- Add responsive design for Profile page (mobile-friendly)
- Remove unused strategy_code module and database table
- Fix LLM service to support multiple providers (OpenRouter, OpenAI, DeepSeek, Grok, Google)
- Add auto-detection of configured LLM provider based on API key availability
- Fix AI code generation to use unified LLMService with proper provider selection
- Fix crypto symbol format handling (ETH/USDT no longer becomes ETH/USDT/USDT)
- Fix Commission display showing '0E-8' in Trading Records
- Fix P&L display for signal-only trades (show '--' for unrealized P&L)
- Fix OAuth login not updating last_login_at for new users
- Add migration script for notification_settings column
- Update env.example with new LLM provider configurations
- Remove ESLint rule that was not defined in config

backend_api_python/app/utils/config_loader.py

@@ -70,6 +70,28 @@ def load_addon_config() -> Dict[str, Any]:
         ('OPENROUTER_TIMEOUT', 'openrouter.timeout', 'int'),
         ('OPENROUTER_CONNECT_TIMEOUT', 'openrouter.connect_timeout', 'int'),
         ('AI_MODELS_JSON', 'ai.models', 'json'),
+        
+        # OpenAI Direct
+        ('OPENAI_API_KEY', 'openai.api_key', 'string'),
+        ('OPENAI_BASE_URL', 'openai.base_url', 'string'),
+        ('OPENAI_MODEL', 'openai.model', 'string'),
+        
+        # Google Gemini
+        ('GOOGLE_API_KEY', 'google.api_key', 'string'),
+        ('GOOGLE_MODEL', 'google.model', 'string'),
+        
+        # DeepSeek
+        ('DEEPSEEK_API_KEY', 'deepseek.api_key', 'string'),
+        ('DEEPSEEK_BASE_URL', 'deepseek.base_url', 'string'),
+        ('DEEPSEEK_MODEL', 'deepseek.model', 'string'),
+        
+        # xAI Grok
+        ('GROK_API_KEY', 'grok.api_key', 'string'),
+        ('GROK_BASE_URL', 'grok.base_url', 'string'),
+        ('GROK_MODEL', 'grok.model', 'string'),
+        
+        # LLM Provider Selection
+        ('LLM_PROVIDER', 'llm.provider', 'string'),
 
         # App
         ('CORS_ORIGINS', 'app.cors_origins', 'string'),