Add personal/team note visibility and edit history.

Notes can be marked personal or team, with revision snapshots and restore from the notes UI.

apps/api/prisma/schema.prisma

@@ -162,6 +162,7 @@ model Organization {
   deals             Deal[]
   activities        Activity[]
   notes             Note[]
+  noteRevisions     NoteRevision[]
   customFields      CustomFieldDefinition[]
   products          Product[]
   notifications     Notification[]
@@ -231,6 +232,7 @@ model User {
   activities     Activity[]   @relation("ActivityAssignee")
   createdActivities Activity[] @relation("ActivityCreator")
   notes          Note[]       @relation("NoteAuthor")
+  noteRevisions  NoteRevision[] @relation("NoteRevisionEditor")
   noteAttachments NoteAttachment[] @relation("NoteAttachmentUploader")
   notifications  Notification[]
   salesGoals     SalesGoal[]  @relation("SalesGoalUser")
@@ -591,14 +593,18 @@ model Note {
   activity       Activity?    @relation(fields: [activityId], references: [id], onDelete: SetNull)
   authorId       String?
   author         User?        @relation("NoteAuthor", fields: [authorId], references: [id], onDelete: SetNull)
+  /// team = قابل‌مشاهده برای تیم/سازمان در محدوده پرونده | personal = فقط نویسنده
+  visibility     String       @default("team")
   attachments    NoteAttachment[]
   aiSuggestion   NoteAiSuggestion?
+  revisions      NoteRevision[]
   createdAt      DateTime     @default(now())
   updatedAt      DateTime     @updatedAt
 
   @@index([organizationId, pinned, updatedAt])
   @@index([organizationId, noteType, updatedAt])
   @@index([organizationId, reminderAt])
+  @@index([organizationId, visibility])
   @@index([personId])
   @@index([companyId])
   @@index([dealId])
@@ -606,6 +612,28 @@ model Note {
   @@index([authorId])
 }
 
+/// اسنپ‌شات متن قبل از هر ویرایش معنادار یادداشت
+model NoteRevision {
+  id             String       @id @default(cuid())
+  organizationId String
+  organization   Organization @relation(fields: [organizationId], references: [id], onDelete: Cascade)
+  noteId         String
+  note           Note         @relation(fields: [noteId], references: [id], onDelete: Cascade)
+  editorId       String?
+  editor         User?        @relation("NoteRevisionEditor", fields: [editorId], references: [id], onDelete: SetNull)
+  title          String?
+  body           String
+  noteType       String
+  visibility     String       @default("team")
+  tags           String[]     @default([])
+  checklist      Json?
+  createdAt      DateTime     @default(now())
+
+  @@index([noteId, createdAt])
+  @@index([organizationId])
+  @@index([editorId])
+}
+
 model NoteAttachment {
   id             String       @id @default(cuid())
   organizationId String