Initial commit: 风影 OA 全栈源码（API/Web/Flutter/IM）

含 Phase 1.1 IM seq 排序、断线重连、多端已读同步与微信式语音转文字 UI。
排除 node_modules、构建产物、安装包与 .env 密钥。

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

apps/api/prisma/migrations/20260902100000_im_message_seq/migration.sql

@@ -0,0 +1,26 @@
+-- Phase 1.1: 会话级单调递增 seq，用于消息排序、去重与断线补拉
+ALTER TABLE "ImConversation" ADD COLUMN IF NOT EXISTS "nextSeq" INTEGER NOT NULL DEFAULT 1;
+
+ALTER TABLE "ImMessage" ADD COLUMN IF NOT EXISTS "seq" INTEGER NOT NULL DEFAULT 0;
+
+ALTER TABLE "ImReadCursor" ADD COLUMN IF NOT EXISTS "lastReadSeq" INTEGER NOT NULL DEFAULT 0;
+
+-- 按 createdAt 回填历史 seq
+WITH ranked AS (
+  SELECT id, ROW_NUMBER() OVER (PARTITION BY "conversationId" ORDER BY "createdAt", id) AS rn
+  FROM "ImMessage"
+)
+UPDATE "ImMessage" m SET seq = ranked.rn FROM ranked WHERE m.id = ranked.id;
+
+UPDATE "ImConversation" c
+SET "nextSeq" = COALESCE((
+  SELECT MAX(seq) + 1 FROM "ImMessage" WHERE "conversationId" = c.id
+), 1);
+
+UPDATE "ImReadCursor" rc
+SET "lastReadSeq" = COALESCE((
+  SELECT MAX(seq) FROM "ImMessage" m
+  WHERE m."conversationId" = rc."conversationId" AND m."createdAt" <= rc."lastReadAt"
+), 0);
+
+CREATE INDEX IF NOT EXISTS "ImMessage_conversationId_seq_idx" ON "ImMessage"("conversationId", "seq");