[backport cloud/1.37] feat: add workspace session, auth, and store infrastructure (#8230)

## Summary
- Backport of #8194 to cloud/1.37
- Adds workspace session, auth, and store infrastructure for team
workspaces

## Test plan
- [ ] Verify workspace session management works correctly
- [ ] Verify team workspace store initializes properly

🤖 Generated with [Claude Code](https://claude.com/claude-code)

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8230-backport-cloud-1-37-feat-add-workspace-session-auth-and-store-infrastructure-2f06d73d365081aea34df344a5ce8249)
by [Unito](https://www.unito.io)

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

src/platform/auth/session/useSessionCookie.ts

@@ -1,5 +1,5 @@
+import { useFeatureFlags } from '@/composables/useFeatureFlags'
 import { isCloud } from '@/platform/distribution/types'
-import { remoteConfig } from '@/platform/remoteConfig/remoteConfig'
 import { api } from '@/scripts/api'
 import { useFirebaseAuthStore } from '@/stores/firebaseAuthStore'
 
@@ -19,12 +19,13 @@ export const useSessionCookie = () => {
   const createSession = async (): Promise<void> => {
     if (!isCloud) return
 
+    const { flags } = useFeatureFlags()
     try {
       const authStore = useFirebaseAuthStore()
 
       let authHeader: Record<string, string>
 
-      if (remoteConfig.value.team_workspaces_enabled) {
+      if (flags.teamWorkspacesEnabled) {
         const firebaseToken = await authStore.getIdToken()
         if (!firebaseToken) {
           console.warn(