Refactor: Dashboard core routing / data strategy to optimize performance (#168)

<!-- CURSOR_SUMMARY -->
> [!NOTE]
> Migrates the dashboard to a team-scoped architecture with centralized
auth + team resolution, cache-tagged server actions, simplified proxy
middleware, and revamped sidebar/team switching; updates all pages/APIs
to use `teamIdOrSlug`.
> 
> - **Core Routing & Auth**:
> - Replace legacy middleware with a simplified `proxy` and new helpers
in `server/proxy` (auth redirects), plus integration tests.
> - Introduce `withTeamIdResolution` middleware to resolve/authorize
`teamIdOrSlug` across server actions.
> - New per-team layout `app/dashboard/[teamIdOrSlug]/layout.tsx` with
`DashboardContextProvider`.
> - **Caching & Config**:
> - Add `CACHE_TAGS`, pervasive `use cache`/`cacheTag`/`cacheLife`, and
`updateTag`-based revalidation.
> - Split cookie config into `configs/cookies`, add
`setTeamCookies`/`getTeamCookies` utils.
>   - Add `TeamIdOrSlugSchema` and helpers for team ID lookup.
> - **Pages & APIs**:
> - Convert billing, usage, templates, sandboxes, members, keys,
webhooks to accept `teamIdOrSlug`; add API for user teams and cookie
setters.
> - Sandboxes restructured into parallel routes (monitoring/list), add
live counter injection and revalidation action.
> - Replace old dashboard layout/server context; remove injectable
header routes and excess Suspense.
> - **Sidebar & UX**:
> - New sidebar header toggle, command palette, team switcher (SWR +
API), hover-prefetch links, and blocked-team banner.
> - **Sitemap & Config**:
> - Export `constructSitemap` and use in rewrites; adjust `next.config`
experimental flags; pipe `start` logs to `pino-pretty`.
> - **Tests**:
>   - Add `proxy` integration tests; remove legacy middleware tests.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
a5af039. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: ben-fornefeld

next.config.mjs

@@ -6,14 +6,13 @@ const config = {
   reactStrictMode: true,
   reactCompiler: true,
   experimental: {
-    staleTimes: {
-      dynamic: 180,
-      static: 180,
-    },
+    useCache: true,
+    turbopackFileSystemCacheForDev: true,
+    clientSegmentCache: true,
     serverActions: {
       bodySizeLimit: '5mb',
     },
-    clientSegmentCache: true,
+    authInterrupts: true,
   },
   logging: {
     fetches: {

package.json

@@ -6,7 +6,7 @@
     "<<<<<<< Next.js": "",
     "dev": "bun scripts:check-app-env && next dev --turbopack | pino-pretty --colorize",
     "build": "next build --turbopack",
-    "start": "next start",
+    "start": "next start | pino-pretty --colorize",
     "preview": "next build --turbopack && next start | pino-pretty --colorize",
     "lint": "next lint",
     "lint:fix": "next lint --fix",