fix(config): default LLM to OpenAI and wire external endpoints

fix(microsoft): use configurable Azure AD client ID for device-code flow (part 2)

fix(microsoft): use configurable Azure AD client ID for device-code flow

Wire LLM7 fallback to all backend LLM endpoints

Fix all usePathname/useSearchParams null checks for HF build

Fix type errors and duplicate routes for HF Spaces build

Deploy mailbox-automation Next.js app