fix: cases CLI/SDK alignment with ext-cases backend

[maximelb]

Summary

• Bug fix: export --with-data used detection_id instead of detect_id when reading detection records from the API response, causing all detection fetches to silently fail (every detection was skipped)
• Missing feature: Add is_public parameter to add_note SDK method and --is-public/--no-is-public flag to CLI add-note command (backend supports it, was not exposed)
• Missing feature: Add update_note_visibility SDK method and update-note CLI command for PATCH /cases/{n}/notes/{id} endpoint (toggle note public/private visibility)
• Missing feature: Add list_orgs SDK method and orgs CLI command for GET /orgs endpoint (discover ext-cases-subscribed organizations)

Test plan

• All 177 existing + new unit tests pass
• SDK tests cover add_note with is_public (true, false, None)
• SDK tests cover update_note_visibility (set public, set private)
• SDK tests cover list_orgs (path, no query params)
• CLI tests cover add-note --is-public / --no-is-public
• CLI tests cover update-note (public, private, missing flags)
• CLI tests cover orgs command
• Export tests updated to use detect_id field name
• Help text test updated to verify new commands appear

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