refactor(env): replace inline process.env reads with BACKEND_URL in tool-ui generators

[VarunShukla07]

Description

refactor(env): replace inline process.env reads with BACKEND_URL in tool-ui generators

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 three tool-ui generator components to replace inline process.env.NEXT_PUBLIC_FASTAPI_BACKEND_URL reads with a centralized BACKEND_URL constant imported from @/lib/env-config. The change improves code maintainability by centralizing environment variable access and follows the DRY principle. This addresses issue #1374.

⏱️ Estimated Review Time: 5-15 minutes

💡 Review Order Suggestion

Order	File Path
1	surfsense_web/components/tool-ui/generate-resume.tsx
2	surfsense_web/components/tool-ui/generate-podcast.tsx
3	surfsense_web/components/tool-ui/video-presentation/generate-video-presentation.tsx

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