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 Remove superseded SQL migration artifacts; rely on auto-migrate.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

Cargo.lock

@@ -1960,6 +1960,7 @@ dependencies = [
  "sha2",
  "sqlx",
  "tempfile",
+ "thiserror",
  "tokio",
  "toml",
  "tracing",
@@ -1968,7 +1969,7 @@ dependencies = [
 
 [[package]]
 name = "secrets-mcp"
-version = "0.3.9"
+version = "0.4.0"
 dependencies = [
  "anyhow",
  "askama",