feat: add review writing page and integrate Steam account linking

- Implemented WriteReviewPage for users to submit reviews with ratings and playtime.
- Created global CSS styles for consistent theming across the application.
- Established RootLayout for metadata and global styles.
- Developed LoginPage for user authentication with email/password and Steam login options.
- Built Home page to display game search results and recent reviews.
- Added LinkSteamPage for linking Steam accounts to user profiles.
- Created ProfilePage to manage user information and display their reviews.
- Developed GameCard and ReviewCard components for displaying games and reviews.
- Implemented Header component for navigation and user session management.
- Added Providers component to wrap the application with session context.
- Integrated NextAuth for user authentication with Steam and credentials.
- Set up Prisma client for database interactions.
- Created Steam API utility functions for fetching game and user data.
- Configured TypeScript settings for the project.

src/app/api/reviews/[id]/vote/route.ts

@@ -0,0 +1,61 @@
+import { NextRequest, NextResponse } from 'next/server'
+import { auth } from '@/lib/auth'
+import { prisma } from '@/lib/db'
+
+export async function POST(
+  request: NextRequest,
+  { params }: { params: Promise<{ id: string }> }
+) {
+  const session = await auth()
+
+  if (!session?.user?.id) {
+    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
+  }
+
+  const resolvedParams = await params
+  const { voteType } = await request.json()
+
+  if (voteType !== 1 && voteType !== -1) {
+    return NextResponse.json({ error: 'Invalid vote type' }, { status: 400 })
+  }
+
+  const review = await prisma.review.findUnique({
+    where: { id: resolvedParams.id }
+  })
+
+  if (!review) {
+    return NextResponse.json({ error: 'Review not found' }, { status: 404 })
+  }
+
+  const existingVote = await prisma.vote.findUnique({
+    where: {
+      user_review_unique: {
+        user_id: session.user.id,
+        review_id: resolvedParams.id
+      }
+    }
+  })
+
+  if (existingVote) {
+    if (existingVote.vote_type === voteType) {
+      await prisma.vote.delete({
+        where: { id: existingVote.id }
+      })
+    } else {
+      await prisma.vote.update({
+        where: { id: existingVote.id },
+        data: { vote_type: voteType }
+      })
+    }
+  } else {
+    await prisma.vote.create({
+      data: {
+        user_id: session.user.id,
+        review_id: resolvedParams.id,
+        vote_type: voteType
+      }
+    })
+  }
+
+  return NextResponse.json({ success: true })
+}