docs: 基本完成初版数据库设计

apps/server/test/logging.test.ts

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+import assert from 'node:assert/strict';
+import { test } from 'node:test';
+import { AppLogger } from '../src/logging/app-logger';
+
+test('日志为单行 JSON，递归脱敏并安全处理循环对象与 bigint', () => {
+    const output: string[] = [];
+    const logger = new AppLogger('info', (line) => output.push(line));
+    const nested: Record<string, unknown> = {
+        password: 'private-password',
+        amount: 9n,
+    };
+    nested.self = nested;
+    logger.log('test_event', {
+        authorization: 'Bearer private-token',
+        nested,
+        body: { code: 'login-secret' },
+    });
+    logger.debug('hidden');
+    assert.equal(output.length, 1);
+    const log = JSON.parse(output[0]!);
+    assert.equal(log.context.authorization, '[REDACTED]');
+    assert.equal(log.context.nested.password, '[REDACTED]');
+    assert.equal(log.context.nested.self, '[Circular]');
+    assert.equal(log.context.nested.amount, '9');
+    assert.equal(log.context.body, '[REDACTED]');
+    assert.ok(!output[0]!.includes('private-'));
+    assert.ok(!output[0]!.includes('login-secret'));
+});