Fix Twilio MCP integration with baked-in credentials

- Add proper type and env sections to mcp-config.json
- Remove dynamic MCP add command, use pre-configured MCP
- Bake .env credentials into Docker image at build time
- Remove runtime .env volume mount - true one-time setup
- Auto-rebuild image when .env file changes
- Export Twilio env vars for MCP server subprocess
- Remove conflicting .mcp.json file

.env.example

@@ -1,12 +1,12 @@
-# ABOUTME: Environment variables for Claude Docker
-# ABOUTME: Copy this to ~/.claude-docker/.env and fill in your values
+# Copy this file to .env and fill in your credentials
+# The .env file will be baked into the Docker image during build
 
-# Optional: Anthropic API key (only needed if not using subscription auth)
-# ANTHROPIC_API_KEY=sk-ant-your_anthropic_api_key_here
+# Required for Claude Code
+ANTHROPIC_API_KEY=your_anthropic_api_key_here
 
-# Optional: Twilio credentials for SMS notifications via MCP
-# TWILIO_ACCOUNT_SID=your_twilio_sid_here
-# TWILIO_API_KEY=your_twilio_api_key_here
-# TWILIO_API_SECRET=your_twilio_api_secret_here
-# TWILIO_FROM_NUMBER=+1234567890  # Your Twilio phone number
-# TWILIO_TO_NUMBER=+1234567890    # Your personal phone to receive SMS
+# Optional: Twilio credentials for SMS notifications
+TWILIO_ACCOUNT_SID=your_twilio_account_sid
+TWILIO_API_KEY=your_twilio_api_key
+TWILIO_API_SECRET=your_twilio_api_secret
+TWILIO_FROM_NUMBER=+1234567890
+TWILIO_TO_NUMBER=+0987654321