Daily login bonus (streak) + solo-ad budget default

- Daily login bonus: once/day, base 5 credits + gentle streak (+1/day, cap +5)
  for consecutive days; granted after sign-in, toast + cha-ching. New
  login_day/login_streak on earned_credits; /api/my/login-bonus.
- Solo ad: selecting Solo now defaults Budget to 50 credits (5cr x 10 min
  deliveries) so entering 10 isn't rejected after submit.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

server.js

@@ -715,6 +715,12 @@ const server = http.createServer(async (req, res) => {
       accounts.touchSeen(s.email).catch(() => {});
       return json(res, 200, { ok: true, chatUnread: await messages.chatUnread(s.email) });
     }
+    // daily login bonus (once/day, gentle streak) — granted after the login flow
+    if (p === '/api/my/login-bonus' && req.method === 'POST') {
+      const s = await auth.fromRequest(req);
+      if (!s || !s.email) return json(res, 401, { error: 'Sign in first.' });
+      return json(res, 200, await ads.grantLoginBonus(s.email));
+    }
     // -- rehearsal test-POL faucet: top a connected wallet up to 10 test-POL
     //    (anvil_setBalance, no key needed). Rehearsal-only, rate-limited.
     if (p === '/api/my/faucet' && req.method === 'POST') {