feat: implement error handling and validation middleware, enhance result handling

Co-authored-by: Copilot <copilot@github.com>

apps/backend/src/lib/http/request-id.ts

@@ -0,0 +1,16 @@
+import type { MiddlewareHandler } from 'hono'
+
+type Env = {
+  Variables: {
+    requestId: string
+  }
+}
+
+export const requestIdMiddleware: MiddlewareHandler<Env> = async (c, next) => {
+  const requestId = crypto.randomUUID()
+
+  c.set('requestId', requestId)
+  c.header('X-Request-Id', requestId)
+
+  await next()
+}