Add Bitwarden Public API and Vault Management API docs

[b0x42]

Summary

Adds two new documentation entries for Bitwarden:

bitwarden/docs/public-api/DOC.md

Bitwarden Public API — RESTful API for managing organization members, collections, groups, event logs, and policies. Covers:

• OAuth2 Client Credentials authentication flow
• Base URLs (US Cloud, EU Cloud, self-hosted)
• All key endpoints (members, collections, groups, events, policies)
• Pagination with continuation tokens
• Response codes, OpenAPI/OAS3 spec links, API key rotation

bitwarden/docs/vault-management-api/DOC.md

Bitwarden Vault Management API — local RESTful API for managing vault items via the CLI bw serve command. Covers:

• Full setup flow (install CLI → login → unlock → serve)
• All endpoints: items, folders, Send, attachments, generate, collections, status/sync/lock/unlock
• Creating items with examples
• Security considerations (unauthenticated local HTTP server)

Validation

$ node cli/bin/chub build content/ --validate-only
Valid: 1555 docs, 6 skills, 0 warnings

Sources

• https://bitwarden.com/help/public-api/
• https://bitwarden.com/help/bitwarden-apis/
• https://bitwarden.com/help/vault-management-api/
• https://bitwarden.com/help/cli/#serve