feat(kura): add Cloudflare global routing

Summary

• Add optional Cloudflare Load Balancing reconciliation to the Kura controller for account-level global Kura hostnames.
• Extend KuraInstance with global public host metadata and Cloudflare pool coordinates, and pass those fields from the server’s managed region catalog.
• Return the account-level Kura endpoint to clients in hosted production and surface it in organization settings.

Validation

• mise x go -- go test ./... from infra/kura-controller
• mise x elixir -- mix format ... for touched Elixir files
• mise x elixir -- mix gettext.extract

Elixir test execution is currently blocked in this fresh worktree because the local test database migration fails before tests run with ERROR 42P01 (undefined_table) relation "users" does not exist.

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