feat(db): 同步种子用户与项目序列避免冷启动主键冲突

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

deploy/postgres/goose/00025_2026-09-13-sync-seed-sequences.sql

@@ -0,0 +1,21 @@
+-- +goose Up
+-- 00011 显式插入 users/projects id 后同步序列，避免冷启动 duplicate key
+BEGIN;
+
+SELECT setval(
+    pg_get_serial_sequence('users', 'id'),
+    COALESCE((SELECT MAX(id) FROM users), 1),
+    true
+);
+
+SELECT setval(
+    pg_get_serial_sequence('projects', 'id'),
+    COALESCE((SELECT MAX(id) FROM projects), 1),
+    true
+);
+
+COMMIT;
+
+-- +goose Down
+-- 序列同步不可逆；Down 为空操作
+SELECT 1;