REFACTOR(repo): simplify project structure

- Move services/nextjs/ to nextjs/
- Move Dockerfile.prod to Dockerfile at root
- Remove deploy/ folder (K8s manifests moved to K3S-HOME/web-apps)
- Remove .gitea/ workflows
- Update GitHub Actions for new structure
- Remove develop branch triggers

nextjs/app/api/todos/route.ts

@@ -0,0 +1,65 @@
+import { NextResponse } from 'next/server'
+import { prisma } from '@/shared/lib/prisma'
+import { corsHeaders, handleCorsPreFlight } from '@/shared/lib/cors'
+
+// OPTIONS - CORS preflight 처리
+export async function OPTIONS() {
+  return handleCorsPreFlight()
+}
+
+// GET - 모든 TODO 가져오기
+export async function GET() {
+  try {
+    const todos = await prisma.todo.findMany({
+      orderBy: { createdAt: 'desc' },
+    })
+    const response = NextResponse.json({ success: true, data: todos })
+    Object.entries(corsHeaders()).forEach(([key, value]) => {
+      response.headers.set(key, value)
+    })
+    return response
+  } catch (error) {
+    console.error('Error fetching todos:', error)
+    const response = NextResponse.json(
+      { success: false, error: 'Failed to fetch todos' },
+      { status: 500 }
+    )
+    Object.entries(corsHeaders()).forEach(([key, value]) => {
+      response.headers.set(key, value)
+    })
+    return response
+  }
+}
+
+// POST - TODO 생성
+export async function POST(request: Request) {
+  try {
+    const body = await request.json()
+    
+    const todo = await prisma.todo.create({
+      data: {
+        title: body.title,
+        description: body.description || null,
+        completed: body.completed || false,
+        priority: body.priority || 'medium',
+      },
+    })
+
+    const response = NextResponse.json({ success: true, data: todo }, { status: 201 })
+    Object.entries(corsHeaders()).forEach(([key, value]) => {
+      response.headers.set(key, value)
+    })
+    return response
+  } catch (error) {
+    console.error('Error creating todo:', error)
+    const response = NextResponse.json(
+      { success: false, error: 'Failed to create todo' },
+      { status: 500 }
+    )
+    Object.entries(corsHeaders()).forEach(([key, value]) => {
+      response.headers.set(key, value)
+    })
+    return response
+  }
+}
+