[ISSUE] Consolidate duplicated hard-coded audio manifests into a single source of truth

[uttamdeepk22]

📝 Issue Description

The audio manifest is currently duplicated in multiple locations:

• src/services/audioApi.js
• src/ReaderScreen/components/AudioPlayer/hooks/useAudioManifest/index.js

Both contain near-identical hard-coded manifests with URLs, durations, and file sizes for all banis and artists.

As a result, when an audio file is replaced or its metadata changes, the following need to remain in sync:

• Backend
• src/services/audioApi.js
• src/ReaderScreen/components/AudioPlayer/hooks/useAudioManifest/index.js

This duplication increases maintenance effort and the risk of inconsistencies.

🔍 Type of Issue

• Question
• Documentation Issue
• Performance Issue
• Accessibility Issue
• Localization Issue
• Other (please specify) - Code Maintenance / Refactoring

Suggested direction

The emergency manifest already exists in useAudioManifest.

Either:

• remove the duplicate manifest from audioApi.js, or
• have both locations consume a single shared manifest.

Context

Created to track the remaining review comment from PR #376 so it is not lost during the merge.