Legacy bridge pages, welcome-back credits, holding-tank alerts

- /from/faucetwave and /from/tieroneads (?seg=advertiser): the squeeze page with
  brand copy and no video, sponsor cookie cleared so arrivals land in the holding
  tank, angle + a legacy:<brand> source recorded on the account.
- legacy.js: private list DATA_DIR/legacy.json (email -> brand, segment); listed
  emails get a one-time credit grant at account creation (legacyCreditsAdvertiser
  500 / legacyCreditsEarner 150, admin-editable), recorded in legacy-grants.json.
- Holding-tank alerts: dashboard payload carries who is waiting (Overview notice
  with usernames + adopt link), and a 15-minute tick posts new arrivals to the
  shared Telegram payments topic.
- Chatbot prompt lines + admin setting labels.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

legacy.js

@@ -0,0 +1,33 @@
+// Legacy bridge: former Faucet Wave / Tier One Ads members (EvolutionScript sites Marty closed)
+// arrive via /from/<brand>; if their email is on the private legacy list (DATA_DIR/legacy.json,
+// email -> { b: 'faucetwave'|'tier1ads'|'both', s: 'a' (advertiser) | 'e' (earner) }) they get a
+// one-time welcome-back credit grant at account creation. Grants are recorded in
+// DATA_DIR/legacy-grants.json so a person is only ever credited once.
+const fs = require('fs');
+const path = require('path');
+let DATA_DIR = null, list = null, grants = null;
+
+function init(opts) { DATA_DIR = opts.dataDir; list = null; grants = null; }
+function load() {
+  if (list === null) { try { list = JSON.parse(fs.readFileSync(path.join(DATA_DIR, 'legacy.json'), 'utf8')); } catch (e) { list = {}; } }
+  if (grants === null) { try { grants = JSON.parse(fs.readFileSync(path.join(DATA_DIR, 'legacy-grants.json'), 'utf8')); } catch (e) { grants = {}; } }
+}
+function reload() { list = null; grants = null; load(); }
+function lookup(email) { load(); return list[String(email || '').trim().toLowerCase()] || null; }
+// credits for this email, or null when not listed / already granted. Records the grant.
+function grant(email, cfg) {
+  load();
+  const e = String(email || '').trim().toLowerCase();
+  const rec = list[e];
+  if (!rec || grants[e]) return null;
+  const credits = rec.s === 'a' ? (Number(cfg.legacyCreditsAdvertiser) || 500) : (Number(cfg.legacyCreditsEarner) || 150);
+  grants[e] = { credits, seg: rec.s, brand: rec.b, at: Date.now() };
+  fs.writeFileSync(path.join(DATA_DIR, 'legacy-grants.json'), JSON.stringify(grants));
+  return { credits, seg: rec.s, brand: rec.b };
+}
+function stats() {
+  load();
+  const g = Object.values(grants);
+  return { listed: Object.keys(list).length, granted: g.length, credits: g.reduce((a, x) => a + (x.credits || 0), 0) };
+}
+module.exports = { init, reload, lookup, grant, stats };