chore: 将 Prisma 数据库文件加入 gitignore

- 更新 .gitignore 规则匹配所有子目录下的 prisma/*.db
- 从 git 跟踪中移除 apps/api/prisma/dev.db

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitignore

@@ -33,8 +33,8 @@ coverage
 .nyc_output
 
 # Prisma
-prisma/*.db
-prisma/*.db-journal
+**/prisma/*.db
+**/prisma/*.db-journal
 
 # Misc
 *.tsbuildinfo