feat: private forum groups - Group/GroupMember models, group CRUD API, invite codes, private threads, groups UI pages

src/app/api/groups/[id]/route.ts

@@ -0,0 +1,59 @@
+import { NextRequest, NextResponse } from "next/server";
+import { prisma } from "@/lib/prisma";
+import { requireAuth } from "@/lib/auth";
+
+// GET /api/groups/[id] — group details + member list
+export async function GET(
+  request: NextRequest,
+  { params }: { params: Promise<{ id: string }> }
+) {
+  try {
+    const auth = await requireAuth(request);
+    if (!auth) {
+      return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+    }
+
+    const { id } = await params;
+
+    const group = await prisma.group.findUnique({
+      where: { id },
+      include: {
+        owner: {
+          select: { id: true, name: true, isPremium: true, isPro: true },
+        },
+        members: {
+          include: {
+            user: {
+              select: { id: true, name: true, isPremium: true, isPro: true },
+            },
+          },
+          orderBy: { joinedAt: "asc" },
+        },
+        _count: {
+          select: { members: true, threads: true },
+        },
+      },
+    });
+
+    if (!group) {
+      return NextResponse.json({ error: "Group not found" }, { status: 404 });
+    }
+
+    // Verify user is a member of this group
+    const isMember = group.members.some((m) => m.userId === auth.userId);
+    if (!isMember) {
+      return NextResponse.json(
+        { error: "You are not a member of this group" },
+        { status: 403 }
+      );
+    }
+
+    return NextResponse.json({ group });
+  } catch (error) {
+    console.error("GET /api/groups/[id] error:", error);
+    return NextResponse.json(
+      { error: "Internal server error" },
+      { status: 500 }
+    );
+  }
+}