fix: serve project favicons with correct mime type

[sabraman]

Summary

• serve project favicons with Mime.getType(...) instead of a hand-written extension map
• keep regression coverage for a .jpeg icon discovered from project HTML metadata

Why

The project favicon proxy resolves arbitrary rel="icon" hrefs from user projects. The original implementation used a smaller custom MIME map than the rest of the server, which caused .jpeg favicons to fall back to application/octet-stream.

This change fixes the .jpeg case and removes the duplicate MIME lookup logic so the favicon route stays aligned with the server's other file-serving paths.

Verification

• bun run vitest apps/server/src/projectFaviconRoute.test.ts
• bun fmt
• bun lint
• bun typecheck

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