Add internal org chat (phase 1) with DM, groups, and org settings.

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

apps/api/prisma/migrations/20260929103000_conversations/migration.sql

@@ -0,0 +1,45 @@
+-- CreateTable
+CREATE TABLE "ConversationSettings" (
+    "organizationId" TEXT NOT NULL,
+    "chatHost" TEXT NOT NULL,
+    "apiKeyCipher" TEXT NOT NULL,
+    "apiKeyIv" TEXT NOT NULL,
+    "apiKeyTag" TEXT NOT NULL,
+    "uploadUrl" TEXT NOT NULL DEFAULT '',
+    "downloadUrl" TEXT NOT NULL DEFAULT '',
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" TIMESTAMP(3) NOT NULL,
+
+    CONSTRAINT "ConversationSettings_pkey" PRIMARY KEY ("organizationId")
+);
+
+-- CreateTable
+CREATE TABLE "ConversationRoom" (
+    "id" TEXT NOT NULL,
+    "organizationId" TEXT NOT NULL,
+    "externalRoomId" TEXT NOT NULL,
+    "kind" TEXT NOT NULL,
+    "name" TEXT,
+    "dmUserMinId" TEXT,
+    "dmUserMaxId" TEXT,
+    "createdByUserId" TEXT,
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" TIMESTAMP(3) NOT NULL,
+
+    CONSTRAINT "ConversationRoom_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateIndex
+CREATE UNIQUE INDEX "ConversationRoom_organizationId_externalRoomId_key" ON "ConversationRoom"("organizationId", "externalRoomId");
+
+-- CreateIndex
+CREATE UNIQUE INDEX "ConversationRoom_organizationId_dmUserMinId_dmUserMaxId_key" ON "ConversationRoom"("organizationId", "dmUserMinId", "dmUserMaxId");
+
+-- CreateIndex
+CREATE INDEX "ConversationRoom_organizationId_kind_idx" ON "ConversationRoom"("organizationId", "kind");
+
+-- AddForeignKey
+ALTER TABLE "ConversationSettings" ADD CONSTRAINT "ConversationSettings_organizationId_fkey" FOREIGN KEY ("organizationId") REFERENCES "Organization"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "ConversationRoom" ADD CONSTRAINT "ConversationRoom_organizationId_fkey" FOREIGN KEY ("organizationId") REFERENCES "Organization"("id") ON DELETE CASCADE ON UPDATE CASCADE;