Add embedded invite enhancements: roles, field invite state, delete endpoint

[VitaliiSkuratovskyi]

Greptile Summary

The PR expands embedded-invite support with role metadata, role-ID-based invitations, signer identity fields, field-invite state, and a document-scoped delete operation.

• Adds role and embedded-invite fields to the document DTO.
• Adds a factory for creating invites using role IDs.
• Exposes and implements deletion of document embedded invites.
• Increments the client library version to 1.0.7 and adds service-level test coverage.

Confidence Score: 4/5

The PR appears safe to merge, with a non-blocking test-strengthening opportunity for the new delete endpoint.

The implementation follows existing client and service conventions, while the only accepted concern is that its test would not detect incorrect endpoint arguments.

Files Needing Attention: client-lib/src/test/java/com/signnow/library/services/DocumentsServiceTest.java

Important Files Changed

Filename	Overview
client-lib/src/main/java/com/signnow/library/dto/Document.java	Adds response mappings for roles and field-invite state plus optional embedded-invite identity fields and a role-ID factory; no concrete mapping defect was established.
client-lib/src/main/java/com/signnow/library/facades/Documents.java	Adds the document-scoped embedded-invite deletion operation to the public facade.
client-lib/src/main/java/com/signnow/library/services/DocumentsService.java	Implements embedded-invite deletion using the same endpoint and path-template conventions as the existing create operation.
client-lib/src/test/java/com/signnow/library/services/DocumentsServiceTest.java	Covers invocation of the new delete method but does not assert its endpoint-specific request arguments.
client-lib/pom.xml	Increments the client artifact version from 1.0.6 to 1.0.7 without changing dependencies.

Sequence Diagram

sequenceDiagram
    participant Caller
    participant DocumentsService
    participant SNClient
    participant SignNowAPI
    Caller->>DocumentsService: deleteDocumentEmbeddedSignInvite(documentId)
    DocumentsService->>SNClient: "DELETE /v2/documents/{document_id}/embedded-invites"
    SNClient->>SignNowAPI: DELETE resolved document endpoint
    SignNowAPI-->>SNClient: Success or API error
    SNClient-->>DocumentsService: Decode/discard String response
    DocumentsService-->>Caller: void or SNException

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