refactor(ui-common): derive UIServerConfigurationSection from Zod schema

refactor(ui-common): derive UIServerConfigurationSection from Zod schema

Make uiServerConfigSchema the single source of truth for the UI server
configuration shape. The hand-written interface in ConfigurationType.ts
is removed; UIServerConfigurationSection is now inferred via z.infer<>.

- Tighten schema: protocol and version use z.enum() instead of z.string()
  (follows existing z.enum(AuthenticationType) pattern, Zod v4)
- Export UIServerConfigurationSection as the primary inferred type
- Export UIServerConfig as a backward-compat alias
- ConfigurationType.ts imports UIServerConfigurationSection from schema.ts
  and re-exports only ConfigurationData
- CLI defaults.ts uses Protocol.UI and ProtocolVersion['0.0.1'] enum values
  instead of plain string literals to satisfy the tightened type
- CLI lifecycle.test.ts updated to use enum values in typed config literal

Zero duplicate field definitions. All quality gates pass.