feat: Implement username/password authentication and registration features

app/api/auth/register/route.ts

@@ -0,0 +1,27 @@
+import { register } from "@/lib/auth"
+import { authSchema } from "@/lib/validation"
+import { ZodError } from "zod"
+
+export const runtime = "edge"
+
+export async function POST(request: Request) {
+  try {
+    const json = await request.json()
+    const body = authSchema.parse(json)
+
+    await register(body.username, body.password)
+    return Response.json({ success: true })
+  } catch (error) {
+    if (error instanceof ZodError) {
+      return Response.json(
+        { error: error.errors[0].message },
+        { status: 400 }
+      )
+    }
+
+    return Response.json(
+      { error: error instanceof Error ? error.message : "注册失败" },
+      { status: 500 }
+    )
+  }
+}