feat: add direct PostgreSQL and ACK deployment support

tests/usage-service.test.ts

@@ -15,15 +15,14 @@ import type { GenerationJob, UsageContext } from "@/lib/types";
 
 let runtimeDir = "";
 const previousEnv = new Map<string, string | undefined>();
-const envNames = ["ZHINIAN_RUNTIME_DIR", "NEXT_PUBLIC_SUPABASE_URL", "SUPABASE_SERVICE_ROLE_KEY"];
+const envNames = ["ZHINIAN_RUNTIME_DIR", "ZHINIAN_DATA_BACKEND"];
 
 describe("usage metering and reports", () => {
   beforeEach(async () => {
     runtimeDir = await mkdtemp(join(tmpdir(), "zhinian-usage-"));
     for (const name of envNames) previousEnv.set(name, process.env[name]);
     process.env.ZHINIAN_RUNTIME_DIR = runtimeDir;
-    delete process.env.NEXT_PUBLIC_SUPABASE_URL;
-    delete process.env.SUPABASE_SERVICE_ROLE_KEY;
+    process.env.ZHINIAN_DATA_BACKEND = "local";
   });
 
   afterEach(async () => {