feat: Implement CLI tool, Celery workers, and VMware collector

Complete implementation of core MVP components:

CLI Tool (src/datacenter_docs/cli.py):
- 11 commands for system management (serve, worker, init-db, generate, etc.)
- Auto-remediation policy management (enable/disable/status)
- System statistics and monitoring
- Rich formatted output with tables and panels

Celery Workers (src/datacenter_docs/workers/):
- celery_app.py with 4 specialized queues (documentation, auto_remediation, data_collection, maintenance)
- tasks.py with 8 async tasks integrated with MongoDB/Beanie
- Celery Beat scheduling (6h docs, 1h data collection, 15m metrics, 2am cleanup)
- Rate limiting (10 auto-remediation/h) and timeout configuration
- Task lifecycle signals and comprehensive logging

VMware Collector (src/datacenter_docs/collectors/):
- BaseCollector abstract class with full workflow (connect/collect/validate/store/disconnect)
- VMwareCollector for vSphere infrastructure data collection
- Collects VMs, ESXi hosts, clusters, datastores, networks with statistics
- MCP client integration with mock data fallback for development
- MongoDB storage via AuditLog and data validation

Documentation & Configuration:
- Updated README.md with CLI commands and Workers sections
- Updated TODO.md with project status (55% completion)
- Added CLAUDE.md with comprehensive project instructions
- Added Docker compose setup for development environment

Project Status:
- Completion: 50% -> 55%
- MVP Milestone: 80% complete (only Infrastructure Generator remaining)
- Estimated time to MVP: 1-2 days

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.env.example

@@ -1,22 +1,92 @@
-# MongoDB
+# =============================================================================
+# Datacenter Documentation System - Configuration Template
+# Copy this file to .env and fill in your actual values
+# =============================================================================
+
+# =============================================================================
+# MongoDB Configuration
+# =============================================================================
 MONGO_ROOT_USER=admin
 MONGO_ROOT_PASSWORD=changeme_secure_mongo_password
 MONGODB_URL=mongodb://admin:changeme_secure_mongo_password@mongodb:27017
 MONGODB_DATABASE=datacenter_docs
 
-# Redis
+# =============================================================================
+# Redis Configuration
+# =============================================================================
 REDIS_PASSWORD=changeme_redis_password
+REDIS_URL=redis://redis:6379/0
 
-# MCP Server
+# =============================================================================
+# MCP Server Configuration
+# =============================================================================
 MCP_SERVER_URL=https://mcp.company.local
 MCP_API_KEY=your_mcp_api_key_here
 
-# Anthropic API
-ANTHROPIC_API_KEY=your_anthropic_api_key_here
+# =============================================================================
+# LLM Configuration (OpenAI-compatible API)
+# Choose one of the configurations below and uncomment it
+# =============================================================================
 
-# CORS
+# --- OpenAI (Default) ---
+LLM_BASE_URL=https://api.openai.com/v1
+LLM_API_KEY=sk-your-openai-api-key-here
+LLM_MODEL=gpt-4-turbo-preview
+# Alternative models: gpt-4, gpt-3.5-turbo
+
+# --- Anthropic Claude (OpenAI-compatible) ---
+# LLM_BASE_URL=https://api.anthropic.com/v1
+# LLM_API_KEY=sk-ant-your-anthropic-key-here
+# LLM_MODEL=claude-sonnet-4-20250514
+# Alternative models: claude-3-opus-20240229, claude-3-sonnet-20240229
+
+# --- LLMStudio (Local) ---
+# LLM_BASE_URL=http://localhost:1234/v1
+# LLM_API_KEY=not-needed
+# LLM_MODEL=your-local-model-name
+
+# --- Open-WebUI (Local) ---
+# LLM_BASE_URL=http://localhost:8080/v1
+# LLM_API_KEY=your-open-webui-key
+# LLM_MODEL=llama3
+# Alternative models: mistral, mixtral, codellama
+
+# --- Ollama (Local) ---
+# LLM_BASE_URL=http://localhost:11434/v1
+# LLM_API_KEY=ollama
+# LLM_MODEL=llama3
+# Alternative models: mistral, mixtral, codellama, phi3
+
+# LLM Generation Settings
+LLM_TEMPERATURE=0.3
+LLM_MAX_TOKENS=4096
+
+# =============================================================================
+# API Configuration
+# =============================================================================
+API_HOST=0.0.0.0
+API_PORT=8000
+WORKERS=4
+
+# =============================================================================
+# CORS Configuration
+# =============================================================================
 CORS_ORIGINS=http://localhost:3000,https://docs.company.local
 
-# Optional
+# =============================================================================
+# Application Settings
+# =============================================================================
 LOG_LEVEL=INFO
 DEBUG=false
+
+# =============================================================================
+# Celery Configuration
+# =============================================================================
+CELERY_BROKER_URL=redis://redis:6379/0
+CELERY_RESULT_BACKEND=redis://redis:6379/0
+
+# =============================================================================
+# Vector Store Configuration
+# =============================================================================
+VECTOR_STORE_PATH=./data/chroma_db
+EMBEDDING_MODEL=sentence-transformers/all-MiniLM-L6-v2