feat: add cc-connect dashboard health integration

Add a protected backend health endpoint and a new dashboard page/sidebar entry so cc-connect operational status is visible in the UI.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

dashboard/frontend/src/App.svelte

@@ -10,6 +10,7 @@
   import ChatSummary from "./routes/ChatSummary.svelte";
   import Security from "./routes/Security.svelte";
   import LiteLLM from "./routes/LiteLLM.svelte";
+  import CcConnect from "./routes/CcConnect.svelte";
   import Login from "./routes/Login.svelte";
   import { onMount } from "svelte";
   import { getToken, checkAuth, setToken, setRefreshToken, currentUser, setCurrentUser, getPreferences, savePreferences } from "./lib/api.js";
@@ -156,6 +157,8 @@
           <Security />
         {:else if page === "litellm" && hasPageAccess("dashboard")}
           <LiteLLM />
+        {:else if page === "cc-connect" && hasPageAccess("dashboard")}
+          <CcConnect />
         {:else}
           <Dashboard />
         {/if}