feat: harden support, localize knowledge and add operator availability [skip ci]

Source-only publication of reviewed commit 64e96a7f423673dc29ad56485be9fc79bce8af1c.

Passed in isolation: focused frontend/backend tests, race checks, TypeScript typecheck, lint, Go compilation, Flowgram build, and deterministic SDK build/tests.

Not accepted as a production release: Next.js export/native assembly remains blocked by environment memory limits; browser interaction and MySQL staging acceptance remain unverified. No production server, database/schema, runtime configuration, deployment, release tag, or workflow execution was performed.

Expected source tree: 0a4a7528e9.

internal/pkg/i18nx/context.go

@@ -1,6 +1,11 @@
+// Modified in the independent AgentDesk fork: localized knowledge workflows and safe display errors.
 package i18nx
 
-import "github.com/gin-gonic/gin"
+import (
+	"context"
+
+	"github.com/gin-gonic/gin"
+)
 
 const contextLocaleKey = "i18nx.locale"
 
@@ -25,3 +30,27 @@ func SetLocale(ctx *gin.Context, locale string) {
 	}
 	ctx.Set(contextLocaleKey, NormalizeLocale(locale))
 }
+
+// localeContextKey is deliberately distinct from Gin's string key.
+type localeContextKey struct{}
+
+// WithLocale carries an explicitly selected application locale without losing
+// the parent's cancellation, deadline, or values. It does not detect a locale
+// from HTTP headers or change the configured default locale.
+func WithLocale(ctx context.Context, locale string) context.Context {
+	if ctx == nil {
+		ctx = context.Background()
+	}
+	return context.WithValue(ctx, localeContextKey{}, NormalizeLocale(locale))
+}
+
+// LocaleFromContext preserves the configured-default behavior of callers that
+// do not provide an explicit locale (including background jobs).
+func LocaleFromContext(ctx context.Context) string {
+	if ctx != nil {
+		if locale, ok := ctx.Value(localeContextKey{}).(string); ok {
+			return NormalizeLocale(locale)
+		}
+	}
+	return DefaultLocale
+}