feat: build the ourspace creator world prototype

[madirewolf]

Summary

• rename the product and workspaces to ourspace with a dark Y2K/internet-core interface
• add local account onboarding, questionnaire, PS1-inspired avatar builder, editable modules, profile songs, galleries, and rave rooms
• add continuous spaceship discovery with creator planets, previews, filters, and read-only visits
• replace the README with a straightforward collaborator quickstart and troubleshooting guide

Dependencies

• No new runtime dependencies were added in this change.

Verification

• pnpm typecheck
• pnpm lint
• pnpm format:check
• pnpm test (14 tests)
• pnpm build

Closes #1