feat: Puente Mayúscula-Minúscula + TTS SpeechSynthesis + E2E fixes

app/api/milestones/route.ts

@@ -0,0 +1,36 @@
+import { NextRequest, NextResponse } from "next/server"
+import { prisma } from "@/lib/db"
+
+export async function GET(request: NextRequest) {
+  const childId = request.nextUrl.searchParams.get("childId")
+  if (!childId) {
+    return NextResponse.json({ error: "childId required" }, { status: 400 })
+  }
+  const milestones = await prisma.milestone.findMany({
+    where: { childId },
+    orderBy: { reachedAt: "desc" },
+  })
+  return NextResponse.json(milestones)
+}
+
+export async function POST(request: Request) {
+  try {
+    const { childId, skillCode } = await request.json()
+    if (!childId || !skillCode) {
+      return NextResponse.json({ error: "childId and skillCode required" }, { status: 400 })
+    }
+    const existing = await prisma.milestone.findUnique({
+      where: { childId_skillCode: { childId, skillCode } },
+    })
+    if (existing) {
+      return NextResponse.json(existing)
+    }
+    const milestone = await prisma.milestone.create({
+      data: { childId, skillCode },
+    })
+    return NextResponse.json(milestone, { status: 201 })
+  } catch (error) {
+    console.error("Milestone error:", error)
+    return NextResponse.json({ error: "Internal error" }, { status: 500 })
+  }
+}