feat: Add photo management features, duplicate detection, attempt limits, and admin deletion

- Add duplicate photo detection (file hash and URL checking)
- Add max attempts per photo with UI counter
- Simplify penalty system (auto-enable when points > 0)
- Prevent scores from going below 0
- Add admin photo deletion functionality
- Improve navigation with always-visible logout
- Prevent users from guessing their own photos

app/api/admin/users/route.ts

@@ -0,0 +1,62 @@
+import { NextRequest, NextResponse } from "next/server"
+import { auth } from "@/lib/auth"
+import { prisma } from "@/lib/prisma"
+import { hashPassword } from "@/lib/utils"
+
+export async function POST(req: NextRequest) {
+  try {
+    const session = await auth()
+
+    if (!session || session.user.role !== "ADMIN") {
+      return NextResponse.json({ error: "Unauthorized" }, { status: 401 })
+    }
+
+    const { name, email, password, role } = await req.json()
+
+    if (!name || !email || !password) {
+      return NextResponse.json(
+        { error: "Name, email, and password are required" },
+        { status: 400 }
+      )
+    }
+
+    // Check if user already exists
+    const existingUser = await prisma.user.findUnique({
+      where: { email },
+    })
+
+    if (existingUser) {
+      return NextResponse.json(
+        { error: "User with this email already exists" },
+        { status: 400 }
+      )
+    }
+
+    const passwordHash = await hashPassword(password)
+
+    const user = await prisma.user.create({
+      data: {
+        name,
+        email,
+        passwordHash,
+        role: role || "USER",
+      },
+    })
+
+    return NextResponse.json(
+      {
+        id: user.id,
+        name: user.name,
+        email: user.email,
+        role: user.role,
+      },
+      { status: 201 }
+    )
+  } catch (error) {
+    console.error("Error creating user:", error)
+    return NextResponse.json(
+      { error: "Internal server error" },
+      { status: 500 }
+    )
+  }
+}