feat(auth,explore): Add NSFW content gating and age verification

- Add automatic NSFW settings for users registering on NSFW nodes
- Implement age verification checkbox on registration form for NSFW nodes
- Add NSFW node detection on explore page with gated content access
- Restrict unauthenticated users from viewing posts on NSFW nodes
- Fetch and display node NSFW status in explore and login pages
- Update node info type to include isNsfw flag across auth flows
- Display age-gated content warning with EyeOff icon for restricted access
- Enforce age verification requirement before registration on adult nodes

src/app/api/auth/register/route.ts

@@ -1,5 +1,7 @@
 import { NextResponse } from 'next/server';
 import { registerUser, createSession } from '@/lib/auth';
+import { db, nodes, users } from '@/db';
+import { eq } from 'drizzle-orm';
 import { z } from 'zod';
 
 const registerSchema = z.object({
@@ -21,6 +23,22 @@ export async function POST(request: Request) {
             data.displayName
         );
 
+        // Check if this is an NSFW node and auto-enable NSFW settings
+        const nodeDomain = process.env.NEXT_PUBLIC_NODE_DOMAIN || 'localhost:3000';
+        const node = await db.query.nodes.findFirst({
+            where: eq(nodes.domain, nodeDomain),
+        });
+
+        if (node?.isNsfw) {
+            // Auto-enable NSFW viewing and mark account as NSFW for users on NSFW nodes
+            await db.update(users)
+                .set({ 
+                    nsfwEnabled: true,
+                    isNsfw: true 
+                })
+                .where(eq(users.id, user.id));
+        }
+
         // Create session for new user
         await createSession(user.id);