feat: add admin users page (likec4)

[parse]

Summary

• Adds /admin/users route to the frontend that fetches directly from user-service:3001
• This bypasses the api-gateway, introducing an architecture violation for testing erode's analyze command

Test plan

• Run erode analyze against this PR to verify it detects the frontend → user-service violation

🤖 Generated with Claude Code

[erode-app]

Architectural Drift Analysis

Component: frontend (Web Frontend)

Selected from 5 candidates

• frontend (Web Frontend)
• api_gateway (API Gateway)
• user_service (User Service)
• product_service (Product Service)
• database (Database)

Status: ⚠️ Issues detected

Detected Issues (1)

• [HIGH] The frontend web application now makes a direct call to the user-service, bypassing the api_gateway. This is a clear architectural violation as the allowed dependencies (per the model) specify that frontend may only connect to the API Gateway (api_gateway) via https, not directly to user_service.
  • Source: packages/frontend/src/index.ts
  • Recommendation: Revert or guard this change; the frontend should only interact with user-service via the api_gateway to preserve architectural boundaries. Alternatively, update the model only if this is an intentional and sustainable architectural shift.

How to Resolve:
Adjust the architecture model to:

• Include missing relationships between components
• Revise component boundaries if code has been relocated
• Record intentional architectural changes

Overview

This PR introduces a direct dependency from the frontend to the user-service, bypassing the mandated api_gateway boundary. This is a high-severity architectural violation and constitutes intentional drift for testing purposes, but should not be merged into production code or the architecture model.

Analysis details

AI Provider	openai
Quick model (Stages 1, 2)	gpt-4.1-mini
Deep model (Stage 3)	gpt-4.1

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Automated by erode