feat(http): add HTTP_PORT and HTTP_MCP_ENDPOINT configuration options

[mborne]

feat(config): add HTTP_PORT and HTTP_MCP_ENDPOINT configuration options (closes #91)

Summary

Adds two new environment variables to customize the HTTP server configuration, and clarifies the default value of HTTP_HOST.

Changes

index.ts

• Replaces the static TRANSPORTS dictionary with a dynamic buildTransport function that reads environment variables.
• Adds support for HTTP_PORT (default: 3000) to configure the listening port.
• Adds support for HTTP_MCP_ENDPOINT (default: /mcp) to configure the MCP endpoint path
• The default value of HTTP_HOST is now explicitly 127.0.0.1 (no behavior change).

docker-compose.yaml

• Passes the HTTP_MCP_ENDPOINT variable to the container (with default /mcp).
• Replaces APP_PORT with HTTP_PORT in the port mapping for consistency with the new environment variables.

README.md

• Documents the new HTTP_PORT and HTTP_MCP_ENDPOINT entries in the configuration table.
• Clarifies the default value of HTTP_HOST ("127.0.0.1" instead of mcp-framework default).
• Fixes indentation in the table of contents.

New environment variables

Variable	Description	Default
HTTP_PORT	MCP listening port	3000
HTTP_MCP_ENDPOINT	MCP HTTP endpoint path	/mcp