docs: add framework leak examples

- Add UserWithFrameworks.ts example showing framework leaks in domain
- Add examples/bad/ directory with anti-pattern demonstrations
- Demonstrate common mistakes: Prisma in domain, Express types, etc.

packages/guardian/examples/bad-architecture/framework-leaks/UserWithFrameworks.ts

@@ -0,0 +1,23 @@
+/**
+ * BAD EXAMPLE: Framework Leaks in Domain Layer
+ * This file should be in a domain layer structure to be detected
+ */
+
+import { PrismaClient } from "@prisma/client"
+import { Request, Response } from "express"
+import axios from "axios"
+
+export class UserWithFrameworkLeaks {
+    private prisma = new PrismaClient()
+
+    async save(): Promise<void> {
+        await this.prisma.user.create({
+            data: { id: "1", email: "test@example.com" },
+        })
+    }
+
+    async validateEmail(email: string): Promise<boolean> {
+        const response = await axios.post("https://api.validator.com/email", { email })
+        return response.data.valid
+    }
+}