Phase 1: Organization CRM core

[wauputr4]

Implement organization and member core: auth, roles, public organization profile API, organization admin API, CLI commands, claim by official email, audit records, and SvelteKit profile skeleton. See docs/05-roadmap.md.

[wauputr4]

Started Phase 1 public read API in PR #10: #10. Includes demo seed command plus public organization, post, and impact report read endpoints. CI is passing.