Add Docker scripts and validation tests for Zen MCP Server

- Created build.sh script for building the Docker image with environment variable checks.
- Added deploy.sh script for deploying the Zen MCP Server with health checks and logging.
- Implemented healthcheck.py to verify server process, Python imports, log directory, and environment variables.
- Developed comprehensive tests for Docker configuration, environment validation, and integration with MCP.
- Included performance tests for Docker image size and startup time.
- Added validation script tests to ensure proper Docker and MCP setup.

.env.docker.example

@@ -0,0 +1,74 @@
+# ===========================================
+# Zen MCP Server - Docker Environment Configuration
+# ===========================================
+
+# Default AI Model
+# Options: "auto", "gemini-2.5-pro", "gpt-4", etc.
+DEFAULT_MODEL=auto
+
+# ===========================================
+# API Keys (Required - at least one)
+# ===========================================
+
+# Google AI (Gemini models)
+GEMINI_API_KEY=your_gemini_api_key_here
+
+# OpenAI (GPT models)
+OPENAI_API_KEY=your_openai_api_key_here
+
+# Anthropic (Claude models - if needed)
+ANTHROPIC_API_KEY=your_anthropic_api_key_here
+
+# xAI (Grok models - if needed)
+XAI_API_KEY=your_xai_api_key_here
+
+# DIAL (unified enterprise access)
+DIAL_API_KEY=your_dial_api_key_here
+DIAL_API_HOST=https://core.dialx.ai
+DIAL_API_VERSION=2025-01-01-preview
+
+# OpenRouter (unified cloud access)
+OPENROUTER_API_KEY=your_openrouter_api_key_here
+
+# Custom API endpoints (Ollama, vLLM, LM Studio, etc.)
+CUSTOM_API_URL=http://localhost:11434/v1
+CUSTOM_API_KEY=
+CUSTOM_MODEL_NAME=llama3.2
+
+# ===========================================
+# Logging Configuration
+# ===========================================
+
+# Log level: DEBUG, INFO, WARNING, ERROR, CRITICAL
+LOG_LEVEL=INFO
+
+# Maximum log file size
+LOG_MAX_SIZE=10MB
+
+# Number of backup log files to keep
+LOG_BACKUP_COUNT=5
+
+# ===========================================
+# Advanced Configuration
+# ===========================================
+
+# Default thinking mode for ThinkDeep tool
+# Options: minimal, low, medium, high, max
+DEFAULT_THINKING_MODE_THINKDEEP=high
+
+# Disabled tools (comma-separated list)
+# Example: DISABLED_TOOLS=testgen,secaudit
+DISABLED_TOOLS=
+
+# Maximum MCP output tokens
+MAX_MCP_OUTPUT_TOKENS=
+
+# ===========================================
+# Docker Configuration
+# ===========================================
+
+# Container name
+COMPOSE_PROJECT_NAME=zen-mcp
+
+# Timezone
+TZ=UTC