v0.14.1 — Mods page fix

Fixes an empty Mods page.

The mod provider was initialized with the catalog root mods, but it looks
for <root>/packages and the build stages mods/preloaded/packages. It
therefore found no packages, returned success — an empty catalog is legal —
and the Mods page rendered empty with no error logged anywhere. The packages
were present in the v0.14.0 zip the whole time; nothing loaded them.

Adaptive Widescreen, MSU-1 audio and Smash 64 Captain Falcon are all back.

The root now comes from the engine (SNES_MOD_CATALOG_ROOT) rather than
being spelled out per title, so the two cannot drift apart again.

Verified on both platforms: the Windows zip extracted and launched with
PATH scrubbed to C:\Windows\system32;C:\Windows with all three packages
listed, and the AppImage carries the same catalog under
mods/preloaded/packages.