chore(release): secrets-mcp 0.4.0

Bump version for the N:N entry_secrets data model and related MCP/Web
changes. Remove superseded SQL migration artifacts; rely on auto-migrate.
Add structured errors, taxonomy normalization, and web i18n helpers.

Made-with: Cursor

.gitignore

@@ -2,7 +2,6 @@
 .env
 .DS_Store
 .cursor/
-# Google OAuth 下载的 JSON 凭据文件
-client_secret_*.apps.googleusercontent.com.json
 *.pem
-tmp/
+tmp/
+client_secret_*.apps.googleusercontent.com.json