perf(revenue): server-render the promotion link and stop settling on reads

Opening the 推广收益 tab was slow because every read path ran settlement
and two COUNT aggregates before the browser could show the link.

- profile-revenue.php: the link input now carries a server-rendered value from
  ReferralAttribution::create_link(), so 复制链接 works on first paint instead
  of after a REST round trip
- CommissionLedger::overview() no longer calls lazy_settle_due(); the
  lazy-settlement hook and its static flag are gone. Settlement runs only on
  the existing hourly aksrt_affiliate_settle_due cron, which uses a larger
  batch (100 vs 20) and would otherwise re-run up to 20 locked
  SELECT..FOR UPDATE + write cycles inside a GET request
- ReferralAttribution::rest_me() drops the lazy_settle_due() call and the
  stats() result; stats() itself is deleted — its two COUNTs (one of them
  COUNT(DISTINCT source_user_id)) had no consumer left once the 推广人数 row
  was removed
- credits.js: reads the link from the already-rendered input and only fetches
  /revenue/me for poster config and commission ratio. A failed fetch no longer
  blocks copying — it silently skips the poster enhancement
- tests: the lazy-settlement contract is inverted to assert the read path stays
  read-only and cron stays wired; new assertions pin the server-rendered value
  and the no-COUNT REST payload

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/widget-system/referral-policy-contract.test.cjs

@@ -61,19 +61,19 @@ test('commission base is the discounted payable amount, not the list price', ()
   assert.match(ledger, /AssetAmount::balance\(is_string\(\$order\['amount'\] \?\? null\) \? \$order\['amount'\] : ''\)/)
 })
 
-test('lazy settlement backstop guards the earnings entry points', () => {
+test('settlement stays off the read path and runs on the cron schedule', () => {
   const ledger = read('src', 'Payment', 'CommissionLedger.php')
   const attribution = read('src', 'Payment', 'ReferralAttribution.php')
 
-  assert.match(ledger, /private static bool \$lazy_settled = false/)
-  assert.match(ledger, /public function lazy_settle_due\(\): void/)
-  assert.match(ledger, /if \(!\\AKSRT\\Settings\\Settings::affiliate_enabled\(\)\) return;/)
-  assert.ok(
-    ledger.indexOf('lazy_settle_due()') < ledger.indexOf('global \$wpdb; \$table=\$this->table\(\'commission_ledger\'\); \$row=\$wpdb->get_row'),
-    'overview() must trigger the backstop before aggregating balances'
-  )
-  // 收益总览与我的推广两个入口都接入了兜底。
-  assert.match(attribution, /CommissionLedger::get_instance\(\)->lazy_settle_due\(\)/)
+  // 懒结算兜底已移除：读路径不得顺带写库（收益页打开慢的主因）。
+  assert.doesNotMatch(ledger, /lazy_settle_due|\$lazy_settled/)
+  // overview() 与 rest_me() 都不再触发结算。
+  assert.doesNotMatch(ledger, /\$this->lazy_settle_due\(\)/)
+  assert.doesNotMatch(attribution, /lazy_settle_due/)
+  assert.doesNotMatch(attribution, /->stats\(/)
+  // 结算只由 hourly 的 wp-cron 事件驱动。
+  assert.match(ledger, /add_action\('aksrt_affiliate_settle_due', \[\$this, 'settle_due'\]\)/)
+  assert.match(ledger, /wp_schedule_event\(time\(\) \+ HOUR_IN_SECONDS, 'hourly', 'aksrt_affiliate_settle_due'\)/)
 })
 
 test('referral codes are self-serve: no admin ops page, granted at registration', () => {