fix: 部分收付累计释额并扩展结算 E2E 与 CI

账期收付改为按累计已付同步 credit_ledger，修复多笔 partial_paid 与坏账核销重复释额；新增 API E2E（占成、权限、部分收付/坏账）与 GitHub Actions e2e-api job。

Co-authored-by: Cursor <cursoragent@cursor.com>

e2e/routes/e2e.php

@@ -65,6 +65,10 @@ Route::prefix('api/v1/_e2e')
         // 信用盘 / SSO / 主站钱包 mock
         Route::post('credit-player/setup', [E2EProvisionController::class, 'setupCreditPlayer'])
             ->name('e2e.credit-player.setup');
+        Route::post('site-operator/setup', [E2EProvisionController::class, 'setupSiteOperator'])
+            ->name('e2e.site-operator.setup');
+        Route::post('settlement/reset', [E2EProvisionController::class, 'resetSiteSettlement'])
+            ->name('e2e.settlement.reset');
         Route::post('sso/mint-jwt', [E2EProvisionController::class, 'mintSsoJwt'])
             ->name('e2e.sso.mint-jwt');
         Route::post('site/wallet-api', [E2EProvisionController::class, 'configureWalletApi'])