feat: initialize monorepo with shared, server, mcp, and web packages

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

packages/shared/src/db.ts

@@ -0,0 +1,3 @@
+import { PrismaClient } from '@prisma/client';
+
+export const prisma = new PrismaClient();

packages/shared/src/index.ts

@@ -0,0 +1,2 @@
+export { prisma } from './db.js';
+export type * from './types.js';

packages/shared/src/types.ts

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+// Shared types — will be populated as we build features
+export type ApiResponse<T = unknown> = {
+  success: boolean;
+  data?: T;
+  error?: {
+    code: string;
+    message: string;
+  };
+};