feat(billing): add metering formula admin tab

Expose margin multiplier, FX rate, and cost-mode settings under 计费中心 so operators can adjust DeepSeek billing without env edits.

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

server/bootstrap.mjs

@@ -39,6 +39,7 @@ export async function bootstrapAdminServices() {
   );
   const { createPersonalMemoryCandidateStore } = await importMemind('memory-v2-personal-store.mjs');
   const { createSkillRuntimeAdminConfigService } = await importMemind('skill-runtime-admin-config.mjs');
+  const { createBillingAdminConfigService } = await importMemind('billing-admin-config.mjs');
   const { createAssetGatewayConfigService } = await importMemind('asset-gateway.mjs');
   const { ensureAssetGatewaySchema } = await importMemind('db.mjs');
   const { createWechatScheduleLlmConfigService } = await importMemind('wechat-schedule-llm-config.mjs');
@@ -118,6 +119,10 @@ export async function bootstrapAdminServices() {
     env: process.env,
     h5Root,
   });
+  const billingConfigService = createBillingAdminConfigService(pool, {
+    env: process.env,
+  });
+  await billingConfigService.ensureSchema();
   const wechatScheduleLlmConfigService = createWechatScheduleLlmConfigService(pool, {
     env: process.env,
   });
@@ -184,6 +189,7 @@ export async function bootstrapAdminServices() {
     orchestratorObservabilityService,
     personalMemoryCandidateStore,
     skillRuntimeConfigService,
+    billingConfigService,
     wechatScheduleLlmConfigService,
     adminSystemTestService,
     systemTestAccountService,