feat: auto-resolve org slug from API token

[mikolalysenko]

Summary

• When SOCKET_API_TOKEN is set but no org slug is provided (--org or SOCKET_ORG_SLUG), auto-resolve it by querying GET /v0/organizations
• Removes the hard error "Error: --org is required when using SOCKET_API_TOKEN" from get and scan commands
• Enables apply, rollback, and remove telemetry to use the authenticated endpoint instead of silently falling back to the public proxy
• If the token has access to multiple orgs, picks the first and warns the user to pass --org

Changes

• api/types.rs: Added OrganizationInfo and OrganizationsResponse types
• api/client.rs: Added fetch_organizations(), resolve_org_slug(), api_token()/org_slug() accessors; made get_api_client_from_env() async with auto-resolution
• get.rs, scan.rs: Removed --org is required hard error, added .await
• apply.rs, rollback.rs, remove.rs: Use resolved client for telemetry
• repair.rs: Added .await

Test plan

• cargo build compiles cleanly
• cargo test — all 226 tests pass
• Manual: set SOCKET_API_TOKEN without --org, run socket-patch scan — should auto-resolve
• Manual: set SOCKET_API_TOKEN with --org explicit-slug — should use the explicit flag
• Manual: unset SOCKET_API_TOKEN, run socket-patch scan — public proxy path unchanged

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