feat: implement database schema with Prisma ORM

Add PostgreSQL schema with 8 models (User, Session, McpServer, McpProfile,
Project, ProjectMcpProfile, McpInstance, AuditLog), comprehensive model
tests (31 passing), seed data for default MCP servers, and package exports.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/db/tests/seed.test.ts

@@ -0,0 +1,71 @@
+import { describe, it, expect, beforeAll, afterAll, beforeEach } from 'vitest';
+import type { PrismaClient } from '@prisma/client';
+import { setupTestDb, cleanupTestDb, clearAllTables } from './helpers.js';
+import { seedMcpServers, defaultServers } from '../src/seed/index.js';
+
+let prisma: PrismaClient;
+
+beforeAll(async () => {
+  prisma = await setupTestDb();
+}, 30_000);
+
+afterAll(async () => {
+  await cleanupTestDb();
+});
+
+beforeEach(async () => {
+  await clearAllTables(prisma);
+});
+
+describe('seedMcpServers', () => {
+  it('seeds all default servers', async () => {
+    const count = await seedMcpServers(prisma);
+    expect(count).toBe(defaultServers.length);
+
+    const servers = await prisma.mcpServer.findMany({ orderBy: { name: 'asc' } });
+    expect(servers).toHaveLength(defaultServers.length);
+
+    const names = servers.map((s) => s.name);
+    expect(names).toContain('slack');
+    expect(names).toContain('github');
+    expect(names).toContain('jira');
+    expect(names).toContain('terraform');
+  });
+
+  it('is idempotent (upsert)', async () => {
+    await seedMcpServers(prisma);
+    const count = await seedMcpServers(prisma);
+    expect(count).toBe(defaultServers.length);
+
+    const servers = await prisma.mcpServer.findMany();
+    expect(servers).toHaveLength(defaultServers.length);
+  });
+
+  it('seeds envTemplate correctly', async () => {
+    await seedMcpServers(prisma);
+    const slack = await prisma.mcpServer.findUnique({ where: { name: 'slack' } });
+    const envTemplate = slack!.envTemplate as Array<{ name: string; isSecret: boolean }>;
+    expect(envTemplate).toHaveLength(2);
+    expect(envTemplate[0].name).toBe('SLACK_BOT_TOKEN');
+    expect(envTemplate[0].isSecret).toBe(true);
+  });
+
+  it('accepts custom server list', async () => {
+    const custom = [
+      {
+        name: 'custom-server',
+        description: 'Custom test server',
+        packageName: '@test/custom',
+        transport: 'STDIO' as const,
+        repositoryUrl: 'https://example.com',
+        envTemplate: [],
+      },
+    ];
+    const count = await seedMcpServers(prisma, custom);
+    expect(count).toBe(1);
+
+    const servers = await prisma.mcpServer.findMany();
+    expect(servers).toHaveLength(1);
+    expect(servers[0].name).toBe('custom-server');
+  });
+});