[plan] Fix MCPGatewayConfig naming collision

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Objective

Resolve the critical type name collision where MCPGatewayConfig is defined with completely different structures in two locations.

Context

The same type name MCPGatewayConfig exists in:

1. pkg/cli/mcp_gateway_command.go:24 - Container for multiple MCP servers
2. pkg/workflow/tools_types.go:235 - Configuration for gateway execution

These represent fundamentally different concepts and need distinct names.

Approach

1. Rename pkg/cli/mcp_gateway_command.go:24 type to MCPGatewayServersConfig
2. Rename pkg/workflow/tools_types.go:235 type to MCPGatewayRuntimeConfig
3. Update all references throughout the codebase:
   • Search for MCPGatewayConfig usage
   • Update to use the appropriate renamed type based on context
   • Update struct literal instantiations
4. Run make test to verify no breakage

Files to Modify

• pkg/cli/mcp_gateway_command.go - Rename type and update references
• pkg/workflow/tools_types.go - Rename type and update references
• Find and update all files referencing these types (use grep/ripgrep)

Acceptance Criteria

• No type name collisions exist
• Type names clearly indicate their purpose (servers vs runtime)
• All references updated correctly
• All tests pass (make test)
• Build succeeds (make build)

Estimated Effort

2-3 hours
Related to #7369

AI generated by Plan Command for discussion #7368