feat: implement label management with color filtering

keep-notes/app/api/labels/[id]/route.ts

@@ -0,0 +1,88 @@
+import { NextRequest, NextResponse } from 'next/server'
+import prisma from '@/lib/prisma'
+
+// GET /api/labels/[id] - Get a specific label
+export async function GET(
+  request: NextRequest,
+  { params }: { params: Promise<{ id: string }> }
+) {
+  try {
+    const { id } = await params
+    const label = await prisma.label.findUnique({
+      where: { id }
+    })
+
+    if (!label) {
+      return NextResponse.json(
+        { success: false, error: 'Label not found' },
+        { status: 404 }
+      )
+    }
+
+    return NextResponse.json({
+      success: true,
+      data: label
+    })
+  } catch (error) {
+    console.error('GET /api/labels/[id] error:', error)
+    return NextResponse.json(
+      { success: false, error: 'Failed to fetch label' },
+      { status: 500 }
+    )
+  }
+}
+
+// PUT /api/labels/[id] - Update a label
+export async function PUT(
+  request: NextRequest,
+  { params }: { params: Promise<{ id: string }> }
+) {
+  try {
+    const { id } = await params
+    const body = await request.json()
+    const { name, color } = body
+
+    const label = await prisma.label.update({
+      where: { id },
+      data: {
+        ...(name && { name: name.trim() }),
+        ...(color && { color })
+      }
+    })
+
+    return NextResponse.json({
+      success: true,
+      data: label
+    })
+  } catch (error) {
+    console.error('PUT /api/labels/[id] error:', error)
+    return NextResponse.json(
+      { success: false, error: 'Failed to update label' },
+      { status: 500 }
+    )
+  }
+}
+
+// DELETE /api/labels/[id] - Delete a label
+export async function DELETE(
+  request: NextRequest,
+  { params }: { params: Promise<{ id: string }> }
+) {
+  try {
+    const { id } = await params
+    await prisma.label.delete({
+      where: { id }
+    })
+
+    return NextResponse.json({
+      success: true,
+      message: 'Label deleted successfully'
+    })
+  } catch (error) {
+    console.error('DELETE /api/labels/[id] error:', error)
+    return NextResponse.json(
+      { success: false, error: 'Failed to delete label' },
+      { status: 500 }
+    )
+  }
+}