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.

prisma/schema.prisma

@@ -0,0 +1,72 @@
+generator client {
+  provider = "prisma-client-js"
+}
+
+datasource db {
+  provider = "postgresql"
+  url      = env("DATABASE_URL")
+}
+
+model User {
+  id                String    @id @default(uuid())
+  email             String    @unique
+  username          String    @unique
+  passwordHash      String    @map("password_hash")
+  steamId           String?   @unique @map("steam_id")
+  steamPersonaname  String?   @map("steam_personaname")
+  steamAvatar       String?   @map("steam_avatar")
+  createdAt         DateTime  @default(now()) @map("created_at")
+
+  reviews Review[]
+  votes   Vote[]
+
+  @@map("users")
+}
+
+model Game {
+  appId           Int       @id @map("app_id")
+  name            String
+  description     String?   @db.Text
+  headerImage     String?   @map("header_image")
+  capsuleImage    String?   @map("capsule_image")
+  backgroundImage String?   @map("background_image")
+  releaseDate     String?   @map("release_date")
+  developers      String[]  @default([])
+  publishers      String[]  @default([])
+  genres          String[]  @default([])
+  updatedAt       DateTime  @updatedAt @map("updated_at")
+
+  reviews Review[]
+
+  @@map("games")
+}
+
+model Review {
+  id            String    @id @default(uuid())
+  userId        String    @map("user_id")
+  appId         Int       @map("app_id")
+  content       String    @db.Text
+  rating        Int
+  playtimeHours Decimal?  @map("playtime_hours") @db.Decimal(6, 2)
+  createdAt     DateTime  @default(now()) @map("created_at")
+
+  user  User  @relation(fields: [userId], references: [id])
+  game  Game  @relation(fields: [appId], references: [appId])
+  votes Vote[]
+
+  @@map("reviews")
+}
+
+model Vote {
+  id         String   @id @default(uuid())
+  userId     String   @map("user_id")
+  reviewId   String   @map("review_id")
+  voteType   Int      @map("vote_type")
+  createdAt  DateTime @default(now()) @map("created_at")
+
+  user   User   @relation(fields: [userId], references: [id])
+  review Review @relation(fields: [reviewId], references: [id])
+
+  @@unique([userId, reviewId]) @map("user_review_unique")
+  @@map("votes")
+}