Initial commit: Elydora Open Source — self-hosted audit platform for AI agents

Full self-hosted port of the Elydora tamper-evident audit protocol:
- Hono API server with PostgreSQL, Redis, MinIO adapters
- Ed25519 signed operations, chain hashing, Merkle epoch rollups
- PBKDF2 password hashing, HMAC-SHA256 JWT, 5-role RBAC
- Next.js management console
- Node.js, Python, and Go SDKs
- Docker Compose for local deployment
- Helm chart for Kubernetes
- Comprehensive security hardening and audit fixes applied

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/server/src/middleware/i18n.ts

@@ -0,0 +1,22 @@
+/**
+ * i18n middleware — language detection from Accept-Language header.
+ *
+ * Reads the Accept-Language request header, detects the preferred
+ * language (English or Chinese), and stores it in the Hono context
+ * so that all downstream handlers and services can access it via
+ * `c.get('lang')`.
+ */
+
+import type { MiddlewareHandler } from 'hono';
+import type { Env, AppVariables } from '../types.js';
+import { detectLanguage } from '../i18n/messages.js';
+
+export const i18nMiddleware: MiddlewareHandler<{
+  Bindings: Env;
+  Variables: AppVariables;
+}> = async (c, next) => {
+  const acceptLanguage = c.req.header('Accept-Language');
+  const lang = detectLanguage(acceptLanguage);
+  c.set('lang', lang);
+  await next();
+};