Add vendor publish to document system

Replace the old snapshot-based system for vendors with the publish
document system, mirroring the prior processing activity / DPIA / TIA
migration. Includes the GraphQL mutation, MCP tool, CLI command, n8n
operation, frontend publish dialog, e2e tests, and a prosemirror
register template covering vendor profile fields plus per-vendor
sections for services, contacts, risk assessments, compliance reports,
BAA and DPA agreements.

The vendor register lives as a generated DocumentTypeRegister document
on the organization, reused across publishes (the major version bumps
on every republish). Approvers can be passed in to create a draft
pending approval; otherwise the version is published immediately. The
frontend Vendors page exposes a Publish button and a Document link
button when the document exists, and pre-fills the previous default
approvers.

Remove snapshot mode entirely from vendors and their sub-entities: drop
snapshotId/sourceId from GraphQL Vendor type and VendorFilter; remove
SnapshotsTypeVendors from the snapshot registry and delete
Vendors.Snapshot, VendorSnapshotter interface and all
*.InsertVendorSnapshots methods on contacts, services, risk
assessments, compliance reports, BAA and DPA. Drop the snapshot routes
and banner from the frontend. The snapshot_id columns remain in the
database but are now filtered out with snapshot_id IS NULL.

Add Get/Upsert/Clear GeneratedDocumentID methods on Vendor backed by a
new vendors_document_id column on generated_documents, matching the
ProcessingActivity/Finding/Obligation pattern.

Signed-off-by: Sacha Al Himdani <sacha@getprobo.com>

pkg/server/api/console/v1/graphql/vendor.graphql

@@ -206,13 +206,8 @@ input VendorRiskAssessmentOrder {
     direction: OrderDirection!
 }
 
-input VendorFilter {
-    snapshotId: ID
-}
-
 type Vendor implements Node {
     id: ID!
-    snapshotId: ID
     name: String!
     category: VendorCategory!
     description: String
@@ -462,6 +457,19 @@ extend type Mutation {
         input: CreateVendorRiskAssessmentInput!
     ): CreateVendorRiskAssessmentPayload!
     assessVendor(input: AssessVendorInput!): AssessVendorPayload!
+    publishVendorList(
+        input: PublishVendorListInput!
+    ): PublishVendorListPayload!
+}
+
+input PublishVendorListInput {
+    organizationId: ID!
+    approverIds: [ID!]
+}
+
+type PublishVendorListPayload {
+    documentEdge: DocumentEdge!
+    documentVersionEdge: DocumentVersionEdge!
 }
 
 input CreateVendorInput {