Remove FUSE passthrough, flake.nix, and stop archiving build output

FUSE passthrough caused Wine DLL loading failures (ERROR_NOACCESS 0x3E6)
for all file types, not just executables. Root cause is a kernel-level
incompatibility between FUSE passthrough I/O and Wine's file access
patterns. Removed all passthrough code, the passthrough helper binary,
libcap dependency, and the settings UI toggle.

Also removed flake.nix (unused with Docker build system) and stopped
tar.gz'ing the build output since GitHub zips release assets automatically.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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