Neon / portal template support (#713)

TODOs:
- [x] Do restart when checkout / restore if there is a DB
- [x] List all branches (branch id, name, date)
- [x] Allow checking out versions with no DB
- [x] safeguard to never delete main branches
- [x] create app hook for neon template
- [x] weird UX with connector on configure panel
- [x] tiny neon logo in connector
- [x] deploy to vercel
- [x] build forgot password page
- [x] what about email setup
- [x] lots of imgix errors
- [x] edit file - db snapshot
- [x] DYAD_DISABLE_DB_PUSH
- [ ] update portal doc
- [x] switch preview branch to be read-only endpoint
- [x] disable supabase sys prompt if neon is enabled
- [ ] https://payloadcms.com/docs/upload/storage-adapters
- [x] need to use main branch...

Phase 2?
- [x] generate DB migrations

src/ipc/handlers/chat_stream_handlers.ts

@@ -456,7 +456,10 @@ ${componentSnippet}
             (await getSupabaseContext({
               supabaseProjectId: updatedChat.app.supabaseProjectId,
             }));
-        } else {
+        } else if (
+          // Neon projects don't need Supabase.
+          !updatedChat.app?.neonProjectId
+        ) {
           systemPrompt += "\n\n" + SUPABASE_NOT_AVAILABLE_SYSTEM_PROMPT;
         }
         const isSummarizeIntent = req.prompt.startsWith(