refactor(env): replace inline process.env reads with BACKEND_URL in lib/

[VarunShukla07]

Description

Replaced inline process.env.NEXT_PUBLIC_FASTAPI_BACKEND_URL reads in lib/ files with BACKEND_URL imported from @/lib/env-config

Motivation and Context

FIX #1374

Screenshots

API Changes

• This PR includes API changes

Change Type

• Refactoring

Testing Performed

• Tested locally
• Manual/QA verification

Checklist

• Follows project coding standards and conventions
• Documentation updated as needed
• Dependencies updated as needed
• No lint/build errors or new warnings
• All relevant tests are passing

High-level PR Summary

This PR refactors the lib/ directory to eliminate inline process.env.NEXT_PUBLIC_FASTAPI_BACKEND_URL reads by replacing them with a centralized BACKEND_URL constant imported from @/lib/env-config. The changes affect three files: the base API service initialization, authentication utilities (logout and token refresh functions), and thread persistence URL generation. This improves code maintainability by centralizing environment variable access and removes hardcoded fallback URLs.

⏱️ Estimated Review Time: 5-15 minutes

💡 Review Order Suggestion

Order	File Path
1	surfsense_web/lib/apis/base-api.service.ts
2	surfsense_web/lib/auth-utils.ts
3	surfsense_web/lib/chat/thread-persistence.ts

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