feat: Define User GraphQL types and user profile query

src/graphql/schema.ts

@@ -129,6 +129,19 @@ export const typeDefs = /* GraphQL */ `
     url: String!
   }
 
+  type User {
+    name: String!
+    avatar: Image!
+    statistics: UserAnimeStatistics!
+  }
+
+  type UserAnimeStatistics {
+    count: Int!
+    meanScore: Float!
+    minutesWatched: Int!
+    episodesWatched: Int!
+  }
+
   # ====================
   # Input Types
   # ====================
@@ -181,6 +194,11 @@ export const typeDefs = /* GraphQL */ `
       page: Int = 1
       limit: Int = 10
     ): PopularResult!
+
+    """
+    Fetch the authenticated user's profile
+    """
+    user: User!
   }
 
   # ====================