Simplify proxy routing and configuration

PRODUCT.md

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+# Product
+
+## Register
+
+product
+
+## Users
+
+macOS users without networking or Docker expertise. They open the client only to add a VPN subscription, choose a server, and turn the connection on or off.
+
+## Product Purpose
+
+Provide a small, dependable control surface for the Docker-based macOS VPN client. Success means the current connection state is obvious and the full everyday workflow fits on one screen.
+
+## Brand Personality
+
+Soft, calm, precise. Familiar to macOS users, with sharper geometry and a quiet monospace character.
+
+## Anti-references
+
+Not an admin dashboard, network console, settings maze, or enclosing card. Avoid sidebars, technical route diagrams, framed content areas, decorative effects, and controls for gateway or server administration.
+
+## Design Principles
+
+- One screen, one primary action.
+- Use plain language and hide implementation details.
+- Make connection state unmistakable without relying on color alone.
+- Prefer native controls and predictable macOS behavior.
+- Show saved subscriptions as a domain, not as a credential-like URL.
+- Make servers directly selectable instead of hiding them in a dropdown.
+- Keep advanced and server-only features out of the client path.
+
+## Accessibility & Inclusion
+
+Support keyboard navigation, visible focus, sufficient contrast, system light and dark themes, and reduced motion preferences.