Add measure-document linking

Introduce the ability to link measures to documents, following the
existing pattern used by controls and risks. This includes:

- Database migration for measures_documents join table
- Coredata MeasureDocument struct with insert/delete operations
- Document service methods for listing/counting by measure ID
- Measure service CreateDocumentMapping/DeleteDocumentMapping methods
- Cleanup of measure-document mappings on document archive
- GraphQL mutations, inputs, payloads, and Measure.documents field
- DocumentConnection.TotalCount support for measure resolver
- MCP linkMeasure/unlinkMeasure updated to support documents
- MCP listMeasureDocuments tool
- Frontend MeasureDocumentsTab with LinkedDocumentsCard integration
- Authorization actions for measure document mapping
- E2e tests for measure document mapping

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

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

@@ -2492,6 +2492,15 @@ type Measure implements Node {
         filter: ControlFilter
     ): ControlConnection! @goField(forceResolver: true)
 
+    documents(
+        first: Int
+        after: CursorKey
+        last: Int
+        before: CursorKey
+        orderBy: DocumentOrder
+        filter: DocumentFilter
+    ): DocumentConnection! @goField(forceResolver: true)
+
     createdAt: Datetime!
     updatedAt: Datetime!
 
@@ -3830,6 +3839,12 @@ type Mutation {
     deleteRiskDocumentMapping(
         input: DeleteRiskDocumentMappingInput!
     ): DeleteRiskDocumentMappingPayload!
+    createMeasureDocumentMapping(
+        input: CreateMeasureDocumentMappingInput!
+    ): CreateMeasureDocumentMappingPayload!
+    deleteMeasureDocumentMapping(
+        input: DeleteMeasureDocumentMappingInput!
+    ): DeleteMeasureDocumentMappingPayload!
     createRiskObligationMapping(
         input: CreateRiskObligationMappingInput!
     ): CreateRiskObligationMappingPayload!
@@ -4571,6 +4586,16 @@ input DeleteRiskDocumentMappingInput {
     documentId: ID!
 }
 
+input CreateMeasureDocumentMappingInput {
+    measureId: ID!
+    documentId: ID!
+}
+
+input DeleteMeasureDocumentMappingInput {
+    measureId: ID!
+    documentId: ID!
+}
+
 input CreateRiskObligationMappingInput {
     riskId: ID!
     obligationId: ID!
@@ -5331,6 +5356,16 @@ type DeleteRiskDocumentMappingPayload {
     deletedDocumentId: ID!
 }
 
+type CreateMeasureDocumentMappingPayload {
+    measureEdge: MeasureEdge!
+    documentEdge: DocumentEdge!
+}
+
+type DeleteMeasureDocumentMappingPayload {
+    deletedMeasureId: ID!
+    deletedDocumentId: ID!
+}
+
 type CreateRiskObligationMappingPayload {
     riskEdge: RiskEdge!
     obligationEdge: ObligationEdge!