Add ThreatHunt agent backend/frontend scaffolding

.env.example

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+# Docker environment configuration
+# Copy this to .env and customize for your deployment
+
+# Agent Configuration
+# Choose one: local, networked, online, auto
+THREAT_HUNT_AGENT_PROVIDER=auto
+
+# Local Provider (on-device or on-prem models)
+# THREAT_HUNT_LOCAL_MODEL_PATH=/models/model.gguf
+
+# Networked Provider (shared internal inference service)
+# THREAT_HUNT_NETWORKED_ENDPOINT=http://inference-service:5000
+# THREAT_HUNT_NETWORKED_KEY=api-key-here
+
+# Online Provider (external hosted APIs)
+# THREAT_HUNT_ONLINE_API_KEY=sk-your-api-key
+# THREAT_HUNT_ONLINE_PROVIDER=openai
+# THREAT_HUNT_ONLINE_MODEL=gpt-3.5-turbo
+
+# Agent Behavior
+THREAT_HUNT_AGENT_MAX_TOKENS=1024
+THREAT_HUNT_AGENT_REASONING=true
+THREAT_HUNT_AGENT_HISTORY_LENGTH=10
+THREAT_HUNT_AGENT_FILTER_SENSITIVE=true
+
+# Frontend
+REACT_APP_API_URL=http://localhost:8000