feat(activities): split customer column, wider search, custom activity types with type-specific fields

- Table: separate assignee and customer columns; search by assignee and activity type
- ActivityTypeDef model with per-type field definitions (text, select, checklist, participants, ...)
- Default types incl. meeting subject/participants and task checklist; admins manage types
- Participants see activities in their lists and get notified

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/api/prisma/migrations/20261007100000_activity_type_defs/migration.sql

@@ -0,0 +1,37 @@
+-- AlterTable
+ALTER TABLE "Activity" ADD COLUMN     "fields" JSONB,
+ADD COLUMN     "participantIds" TEXT[] DEFAULT ARRAY[]::TEXT[],
+ADD COLUMN     "typeDefId" TEXT;
+
+-- CreateTable
+CREATE TABLE "ActivityTypeDef" (
+    "id" TEXT NOT NULL,
+    "organizationId" TEXT NOT NULL,
+    "name" TEXT NOT NULL,
+    "baseType" "ActivityType" NOT NULL DEFAULT 'task',
+    "icon" TEXT NOT NULL DEFAULT 'check',
+    "color" TEXT NOT NULL DEFAULT 'green',
+    "fields" JSONB NOT NULL DEFAULT '[]',
+    "position" INTEGER NOT NULL DEFAULT 0,
+    "isActive" BOOLEAN NOT NULL DEFAULT true,
+    "isSystem" BOOLEAN NOT NULL DEFAULT false,
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" TIMESTAMP(3) NOT NULL,
+
+    CONSTRAINT "ActivityTypeDef_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateIndex
+CREATE INDEX "ActivityTypeDef_organizationId_position_idx" ON "ActivityTypeDef"("organizationId", "position");
+
+-- CreateIndex
+CREATE UNIQUE INDEX "ActivityTypeDef_organizationId_name_key" ON "ActivityTypeDef"("organizationId", "name");
+
+-- CreateIndex
+CREATE INDEX "Activity_typeDefId_idx" ON "Activity"("typeDefId");
+
+-- AddForeignKey
+ALTER TABLE "ActivityTypeDef" ADD CONSTRAINT "ActivityTypeDef_organizationId_fkey" FOREIGN KEY ("organizationId") REFERENCES "Organization"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "Activity" ADD CONSTRAINT "Activity_typeDefId_fkey" FOREIGN KEY ("typeDefId") REFERENCES "ActivityTypeDef"("id") ON DELETE SET NULL ON UPDATE CASCADE;

apps/api/prisma/schema.prisma

@@ -207,6 +207,7 @@ model Organization {
   leads                  Lead[]
   leadStages             LeadStage[]
   activityStages         ActivityStage[]
+  activityTypeDefs       ActivityTypeDef[]
   leadEvents             LeadEvent[]
   leadImportJobs         LeadImportJob[]
   conversationSettings   ConversationSettings?
@@ -646,6 +647,30 @@ model ActivityStage {
   @@index([organizationId, position])
 }
 
+/// نوع فعالیت قابل تعریف توسط سازمان با فیلدهای اختصاصی
+model ActivityTypeDef {
+  id             String       @id @default(cuid())
+  organizationId String
+  organization   Organization @relation(fields: [organizationId], references: [id], onDelete: Cascade)
+  name           String
+  /// نوع پایه — مبنای گزارش‌ها، یادآورها و سازگاری
+  baseType       ActivityType @default(task)
+  icon           String       @default("check")
+  color          String       @default("green")
+  /// تعریف فیلدها: [{ key, label, type, options?, required?, placeholder? }]
+  fields         Json         @default("[]")
+  position       Int          @default(0)
+  isActive       Boolean      @default(true)
+  /// نوع اصلیِ هر baseType — حذف‌شدنی نیست
+  isSystem       Boolean      @default(false)
+  activities     Activity[]
+  createdAt      DateTime     @default(now())
+  updatedAt      DateTime     @updatedAt
+
+  @@unique([organizationId, name])
+  @@index([organizationId, position])
+}
+
 model Activity {
   id             String         @id @default(cuid())
   organizationId String
@@ -683,10 +708,18 @@ model Activity {
   /// مرحله (ستون کانبان)؛ null یا مرحلهٔ ناهم‌نوع با status → اولین مرحلهٔ هم‌نوع
   stageId        String?
   stage          ActivityStage? @relation(fields: [stageId], references: [id], onDelete: SetNull)
+  /// نوع سفارشی؛ null → نوع اصلیِ همان type
+  typeDefId      String?
+  typeDef        ActivityTypeDef? @relation(fields: [typeDefId], references: [id], onDelete: SetNull)
+  /// مقادیر فیلدهای اختصاصی نوع (کلید فیلد → مقدار)
+  fields         Json?
+  /// کاربران شرکت‌کننده؛ فعالیت در لیست آن‌ها هم دیده می‌شود
+  participantIds String[]       @default([])
   createdAt      DateTime       @default(now())
   updatedAt      DateTime       @updatedAt
 
   @@index([stageId])
+  @@index([typeDefId])
   @@index([organizationId, status, dueAt])
   @@index([organizationId, assigneeId])
   @@index([organizationId, createdById])