Add web frontend

web/README.md

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+# Sybil Web
+
+Preact + Vite frontend for the Sybil backend.
+
+## Setup
+
+1. Copy env values:
+
+```bash
+cp .env.example .env
+```
+
+2. Install and run:
+
+```bash
+npm install
+npm run dev
+```
+
+Default dev URL: `http://localhost:5173`
+
+## Environment variables
+
+- `VITE_API_BASE_URL`: backend API base URL. Defaults to `http://localhost:8787`.
+- `VITE_ADMIN_TOKEN`: optional. Pre-fills a token in the login form.
+
+## Authentication
+
+- On startup, the app checks `GET /v1/auth/session`.
+- If backend runs with `ADMIN_TOKEN`, sign in using that token.
+- If backend runs in open mode (`ADMIN_TOKEN` unset), you can continue without a token.
+- The entered token is stored in browser `localStorage` and can be cleared via Logout.
+
+## UI
+
+- Left panel: conversation list + new chat.
+- Right panel: selected transcript + model controls + composer.
+- Sending a message uses `POST /v1/chat-completions` and then refreshes chat history from the backend.