Add processing activity, DPIA and TIA publish to document system

Replace the old PDF/snapshot-based exports for processing activities,
Data Protection Impact Assessments and Transfer Impact Assessments with
the publish document system. Includes GraphQL mutations, MCP tools, CLI
commands, n8n operations, frontend publish dialogs, e2e tests, and
prosemirror register templates that mirror the previous PDF layouts.

Each 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
ProcessingActivities page exposes a Publish dropdown per register and a
Document link button per active tab, pre-fills the previous default
approvers, and navigates to the published document on success.

Remove snapshot mode entirely from these three entities: drop snapshotId
and sourceId from GraphQL schemas, types, filters, resolvers, MCP spec,
frontend routes and pages; remove SnapshotsTypeProcessingActivities from
the snapshot registry and delete the ProcessingActivities.Snapshot,
ProcessingActivitySnapshotter interface and *.InsertProcessingActivitySnapshots
methods. 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 each entity type
(ProcessingActivity, DataProtectionImpactAssessment,
TransferImpactAssessment) backed by new columns in the generated_documents
table, matching the Finding/Obligation pattern.

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

pkg/coredata/processing_activity_vendor.go

@@ -17,7 +17,6 @@ package coredata
 import (
 	"context"
 	"fmt"
-	"maps"
 	"time"
 
 	"github.com/jackc/pgx/v5"
@@ -35,10 +34,6 @@ type (
 	}
 
 	ProcessingActivityVendors []*ProcessingActivityVendor
-
-	ProcessingActivitySnapshotter interface {
-		InsertProcessingActivitySnapshots(ctx context.Context, conn pg.Tx, scope Scoper, organizationID, snapshotID gid.GID) error
-	}
 )
 
 func (pav ProcessingActivityVendors) Merge(
@@ -124,61 +119,3 @@ FROM vendor_ids
 
 	return nil
 }
-
-func (pav ProcessingActivityVendors) InsertProcessingActivitySnapshots(
-	ctx context.Context,
-	conn pg.Tx,
-	scope Scoper,
-	organizationID gid.GID,
-	snapshotID gid.GID,
-) error {
-	query := `
-WITH
-	source_processing_activities AS (
-		SELECT id
-		FROM processing_activities
-		WHERE organization_id = @organization_id AND snapshot_id IS NULL
-	),
-	snapshot_processing_activities AS (
-		SELECT id, source_id
-		FROM processing_activities
-		WHERE organization_id = @organization_id AND snapshot_id = @snapshot_id
-	),
-	snapshot_vendors AS (
-		SELECT id, source_id
-		FROM vendors
-		WHERE organization_id = @organization_id AND snapshot_id = @snapshot_id
-	),
-	source_processing_activity_vendors AS (
-		SELECT processing_activity_id, vendor_id, snapshot_id, created_at
-		FROM processing_activity_vendors
-		WHERE %s AND processing_activity_id = ANY(SELECT id FROM source_processing_activities) AND snapshot_id IS NULL
-	)
-INSERT INTO processing_activity_vendors (tenant_id, processing_activity_id, vendor_id, organization_id, snapshot_id, created_at)
-SELECT
-	@tenant_id,
-	spa.id,
-	sv.id,
-	@organization_id,
-	@snapshot_id,
-	pav.created_at
-FROM source_processing_activity_vendors pav
-JOIN snapshot_processing_activities spa ON spa.source_id = pav.processing_activity_id
-JOIN snapshot_vendors sv ON sv.source_id = pav.vendor_id
-`
-
-	query = fmt.Sprintf(query, scope.SQLFragment())
-
-	args := pgx.StrictNamedArgs{
-		"snapshot_id":     snapshotID,
-		"organization_id": organizationID,
-	}
-	maps.Copy(args, scope.SQLArguments())
-
-	_, err := conn.Exec(ctx, query, args)
-	if err != nil {
-		return fmt.Errorf("cannot insert processing activity vendor snapshots: %w", err)
-	}
-
-	return nil
-}