feat(billing): 计费商业化重构(积分制)+ 团队差异化调价

统一计价引擎 apps/billing/pricing.py:1积分=¥0.1,平台成本(¥)与用户价(积分)双记账,
视频按火山真实 usage.total_tokens 结算(true-up,终结¥1/段倒贴)+ 首发×1.5毛利系数。
Team.price_multiplier 差异化调价(jimeng同款):挂牌价×系数两步HALF_UP取整,视频类
按下单时的价格/汇率快照结算(中途改配不影响在途任务)。

BillingConfig 单例(汇率/毛利系数/预留buffer,admin可调即刻生效)。存量数据 ×10 rescale
迁移(RunPython+atomic,MySQL 迁移不可中断重跑)。开户赠送归零(DEFAULT_TRIAL_CREDITS=0,
商业决策)。audit_billing 加 I9(卖亏审计)。271 条测试 + tsc/build 全绿。

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

core/backend/apps/adminpanel/urls.py

@@ -2,6 +2,7 @@ from django.urls import path
 
 from .views import (
     admin_asset_reviews,
+    admin_billing_config,
     admin_asset_reviews_poll,
     admin_asset_reviews_submit,
     admin_invitations,
@@ -25,6 +26,7 @@ from .views import (
     admin_quality_words,
     admin_revoke_invitation,
     admin_team_detail,
+    admin_team_pricing,
     admin_team_toggle,
     admin_teams,
     admin_user_reset_password,
@@ -39,6 +41,7 @@ urlpatterns = [
     path("teams/", admin_teams, name="admin-teams"),
     path("teams/<uuid:team_id>/", admin_team_detail, name="admin-team-detail"),
     path("teams/<uuid:team_id>/toggle/", admin_team_toggle, name="admin-team-toggle"),
+    path("teams/<uuid:team_id>/pricing/", admin_team_pricing, name="admin-team-pricing"),
     path("users/", admin_users, name="admin-users"),
     path("users/<uuid:user_id>/toggle/", admin_user_toggle, name="admin-user-toggle"),
     path("users/<uuid:user_id>/reset-password/", admin_user_reset_password, name="admin-user-reset-password"),
@@ -54,6 +57,7 @@ urlpatterns = [
     path("tasks/<uuid:task_id>/retry/", admin_task_retry, name="admin-task-retry"),
     path("ledgers/", admin_ledgers, name="admin-ledgers"),
     path("ledgers/adjust/", admin_ledger_adjust, name="admin-ledger-adjust"),
+    path("billing-config/", admin_billing_config, name="admin-billing-config"),
     path("quota-policies/", admin_quota_policies, name="admin-quota-policies"),
     path("quota-policies/<uuid:policy_id>/", admin_quota_policy_detail, name="admin-quota-policy-detail"),
     path("providers/", admin_providers, name="admin-providers"),