Release v1.3.0: AI feature flag and MCP server

- Add AI_FEATURES_ENABLED config flag to gate AI/natural-language features
- Conditionally register /api/ask router based on AI_FEATURES_ENABLED
- Add GET /api/config/features endpoint for frontend feature detection
- Update frontend to hide Ask panel when AI features are disabled
- Implement standalone MCP server (backend/mcp_server.py) with tools:
  * search_events, get_event, get_summary, ask
- Add mcp dependency to requirements.txt
- Update .env.example, AGENTS.md, and ROADMAP.md
- Bump VERSION to 1.3.0

backend/config.py

@@ -42,7 +42,8 @@ class Settings(BaseSettings):
     # Alerting
     ALERTS_ENABLED: bool = False
 
-    # LLM / Natural Language Query
+    # AI / Natural Language Query
+    AI_FEATURES_ENABLED: bool = True
     LLM_API_KEY: str = ""
     LLM_BASE_URL: str = "https://api.openai.com/v1"
     LLM_MODEL: str = "gpt-4o-mini"
@@ -77,6 +78,7 @@ SIEM_ENABLED = _settings.SIEM_ENABLED
 SIEM_WEBHOOK_URL = _settings.SIEM_WEBHOOK_URL
 ALERTS_ENABLED = _settings.ALERTS_ENABLED
 
+AI_FEATURES_ENABLED = _settings.AI_FEATURES_ENABLED
 LLM_API_KEY = _settings.LLM_API_KEY
 LLM_BASE_URL = _settings.LLM_BASE_URL
 LLM_MODEL = _settings.LLM_MODEL