Support renamed cuiman authentication options

[forman]

Updates the Custom Service provider to accept the authentication options emitted by the refactored Cuiman client configuration.

See required eo-tools/eozilla#192

Changes

• Recognize loginUrl, tokenUrl, grantType, accessToken, and accessTokenHeader in serialized service query parameters.
• Make the renamed access-token fields canonical in the Custom Service schema.
• Support Basic and API-key authentication headers for injected service configurations.
• Use a supplied OAuth2 access token directly, without starting a browser authorization-code flow.
• Keep browser OAuth2/OIDC authentication limited to configurations that explicitly provide browser authorization endpoints.

Validation

• 40 test files, 164 tests passed.
• TypeScript typecheck passed.
• ESLint passed.