REFACTOR(repo): simplify project structure

- Move services/nextjs to nextjs/
- Move deploy/docker/Dockerfile.prod to Dockerfile
- Add GitHub Actions workflows (ci.yml, build.yml)
- Remove deploy/, services/, scripts/ folders

nextjs/app/api/auth/login/route.ts

@@ -0,0 +1,61 @@
+import { NextRequest, NextResponse } from 'next/server'
+import { authenticateUser, generateToken } from '@/shared/lib/auth'
+
+export async function POST(req: NextRequest) {
+  try {
+    const { email, password } = await req.json()
+
+    // Validation
+    if (!email || !password) {
+      return NextResponse.json(
+        { error: 'Email and password are required' },
+        { status: 400 }
+      )
+    }
+
+    // Authenticate user
+    const user = await authenticateUser(email, password)
+
+    if (!user) {
+      return NextResponse.json(
+        { error: 'Invalid credentials' },
+        { status: 401 }
+      )
+    }
+
+    // Generate JWT token
+    const token = generateToken({
+      userId: user.id,
+      email: user.email,
+    })
+
+    // Create response with user data
+    const response = NextResponse.json({
+      message: 'Login successful',
+      token,
+      user: {
+        id: user.id,
+        email: user.email,
+        name: user.name,
+        image: user.image,
+      },
+    })
+
+    // Set auth token in cookie (HttpOnly for security)
+    response.cookies.set('auth-token', token, {
+      httpOnly: true,
+      secure: process.env.NODE_ENV === 'production',
+      sameSite: 'lax',
+      maxAge: 60 * 60 * 24 * 7, // 7 days
+      path: '/',
+    })
+
+    return response
+  } catch (error) {
+    console.error('Login error:', error)
+    return NextResponse.json(
+      { error: 'Internal server error' },
+      { status: 500 }
+    )
+  }
+}