feat: added spa cache control

[akhilmhdh]

Description 📣

This PR does following things

1. Added versioning to frontend assets
2. Resolved caching of index.html that was happening due to etag added
3. Fixed font source failing to load in frontend

Type ✨

• Bug fix
• New feature
• Improvement
• Breaking change
• Documentation

Tests 🛠️

# Here's some code block to paste some code snippets

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[maidul98]

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[greptile-apps]

Greptile Overview

Greptile Summary

This PR implements a proper caching strategy for the SPA by adding versioned asset filenames and configuring appropriate cache headers. The changes address the etag caching issue that was preventing index.html from being properly refreshed.

Key changes:

• Added version-based filenames to frontend assets using INFISICAL_PLATFORM_VERSION for cache busting
• Configured 30-day immutable caching for static assets in @fastify/static plugin
• Disabled all caching mechanisms for index.html (etag, lastModified, maxAge=0) to ensure SPA always loads fresh
• Fixed font loading by moving @fontsource/inter imports from index.css to main.tsx
• Added explicit INFISICAL_PLATFORM_VERSION environment variable in Dockerfile for proper propagation

Confidence Score: 4/5

• This PR is safe to merge with minimal risk - it implements standard SPA caching best practices
• The implementation follows industry-standard patterns for SPA caching (long-lived immutable assets with versioned filenames, fresh index.html). The changes are well-scoped and address specific issues (etag caching, font loading). Minor point deduction because the version string handling with replaceAll(".", "-") is not typical but acceptable for this use case.
• No files require special attention - all changes follow best practices

Important Files Changed

File Analysis

Filename	Score	Overview
backend/src/server/plugins/serve-ui.ts	4/5	Added aggressive caching for static assets (30d immutable) and disabled caching for index.html to prevent SPA stale cache issues
frontend/vite.config.ts	4/5	Added version-based file naming for assets using platform version to enable cache busting

[greptile-apps]

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