platform: modularize api/gui, add docs-tests-web foundation, and refresh root config

selective-vpn-web/README.md

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+# Selective VPN Web (Foundation)
+
+Web prototype foundation for Selective VPN control-plane.
+
+## Stack
+- Vite
+- React + TypeScript
+- React Router
+- TanStack Query
+- Zustand
+
+## Current scope
+- App shell (navigation + layout).
+- Read-only overview (`/healthz`, `/api/v1/status`, `/api/v1/vpn/status`, `/api/v1/vpn/login-state`).
+- SSE connectivity indicator for `/api/v1/events/stream`.
+- Placeholder pages for upcoming VPN/Routes/DNS/Transport/Trace screens.
+
+No mutating controls are enabled at this stage.
+
+## Run
+```bash
+npm install
+npm run dev
+```
+
+## Build
+```bash
+npm run build
+```
+
+## Environment
+Use `.env.example` as a base:
+- `VITE_API_BASE_URL` — absolute API base URL (optional).
+- `VITE_DEV_PROXY_TARGET` — Vite dev proxy target (default `http://127.0.0.1:8080`).
+
+By default, frontend uses same-origin URLs and relies on Vite proxy in dev mode.