fix(linux): restore the ToDesktop platform-level resource fallback

[benceruleanlu]

Part of a stack of review fixes for #1486. Based on #1503.

Summary

#1486 replaced platformOverrides.linux with per-architecture targetOverrides, leaving Linux with no platform-level fallback while Windows keeps both. A ToDesktop target list replaces the platform list rather than merging with it, and ToDesktop decides server-side which architectures a platform builds, so any Linux target outside the x64 and arm64 keys now falls through to the top-level list: ./lib alone.

Such a package ships without resources/apparmor-profile. scripts/after-install.sh then fails its apparmor_parser probe, prints the misleading "this version of AppArmor does not support the bundled profile" message and skips installation, leaving the Electron sandbox blocked on Ubuntu 24.04 and later, with nothing failing at build time.

Feature behavior

Restores platformOverrides.linux, carrying the same three resources as the x64 target and sourcing bootstrap-python from the same staged directory. This mirrors the shape Windows already has. The per-target overrides are unchanged, so the architecture split #1486 introduced still applies wherever ToDesktop honours it.

Test coverage and validation

• A new test requires every platform with per-target overrides to have a platform-level fallback covering the same destinations. It fails with "platformOverrides.linux is missing" when the block is deleted, verified by deleting it.
• The rule covers Windows as well, which had no such coverage.
• Full unit suite: 274 files, 4736 passed, 2 skipped. Typecheck, lint and format pass.
• No remote ToDesktop build was submitted.

Change breakdown

Total changed lines: 51 (45 added, 6 deleted).

Product code

• 0 files; +0 / -0; 0 changed lines; 0%.

Test code

• 1 files; +35 / -6; 41 changed lines; 80.4% of total.
• src/main/sources/standalone/arm64Packaging.test.ts

Documentation

• 0 files; +0 / -0; 0 changed lines; 0%.

Configuration and CI

• 1 files; +10 / -0; 10 changed lines; 19.6% of total.
• todesktop.json

Generated files

• 0 files; +0 / -0; 0 changed lines; 0%.

Lockfiles

• 0 files; +0 / -0; 0 changed lines; 0%.

Vendored code

• 0 files; +0 / -0; 0 changed lines; 0%.

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📥 Commits

Reviewing files that changed from the base of the PR and between 718c06d and 47b4b43.

📒 Files selected for processing (2)

• src/main/sources/standalone/arm64Packaging.test.ts
• todesktop.json

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