feat(dashboard): bearer-token auth with browser persistence + MIT license

Pre-release polish. Two related changes bundled because they both land the
project on public-release footing:

Dashboard auth
- fn dashboard now gates the HTTP API + terminal/badge WebSockets behind a
  bearer token by default. Token resolution order: --token flag,
  FUSION_DASHBOARD_TOKEN env, FUSION_DAEMON_TOKEN env (back-compat), or an
  auto-generated fn_<32 hex>. --no-auth disables. The startup banner prints
  a click-to-open URL with ?token=<token> embedded.
- Auth middleware now also accepts fn_token=<token> as a query-string
  fallback so EventSource and WebSocket clients (which can't set custom
  headers) still authenticate.
- setupTerminalWebSocket / setupBadgeWebSocket now refuse unauthenticated
  upgrades with a proper 401 + socket close.
- Frontend: new auth.ts module captures ?token= off the URL into
  localStorage (key fn.authToken), strips it from the visible URL via
  replaceState, and installs a window.fetch wrapper that injects
  Authorization: Bearer <token> on every same-origin /api/* request.
  EventSource/WebSocket URL builders (api.ts, sse-bus.ts, useTerminal,
  useBadgeWebSocket) route through appendTokenQuery().

MIT license
- LICENSE file at repo root.
- license: "MIT" on root package.json and every packages/*/package.json,
  plus description/bugs metadata on the CLI package.

Docs
- docs/cli-reference.md documents --token / --no-auth / FUSION_DASHBOARD_TOKEN
  and the click-to-open auth flow.
- docs/getting-started.md, docs/docker.md, README.md point at the new flow
  and the CLI reference section.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/dashboard/app/hooks/useBadgeWebSocket.ts

@@ -24,6 +24,7 @@
  */
 import { useCallback, useEffect, useRef, useSyncExternalStore } from "react";
 import type { IssueInfo, PrInfo } from "@fusion/core";
+import { appendTokenQuery } from "../auth";
 
 interface BadgeUpdatedMessage {
   type: "badge:updated";
@@ -194,7 +195,9 @@ class BadgeWebSocketStore {
     if (this.projectId) {
       url += `?projectId=${encodeURIComponent(this.projectId)}`;
     }
-    const ws = new WebSocket(url);
+    // Bearer token must be on the URL — WebSocket construction doesn't
+    // support custom headers. No-op when auth is disabled.
+    const ws = new WebSocket(appendTokenQuery(url));
     this.ws = ws;
 
     ws.onopen = () => {