Refactored monolithic package.nix into separate modules with version information extracted to JSON for maintainability.

Changes

• version.json: Centralized version, URL, and hash data
• meta.nix: Extracted package metadata (description, license, maintainers, platforms)
• linux.nix: Isolated Linux AppImage build logic
• darwin.nix: Isolated macOS build logic
• package.nix: Reduced to orchestration layer (41 lines, down from 99)

Structure

# package.nix - now just orchestration
let
  versionData = lib.importJSON ./version.json;
  meta = import ./meta.nix { inherit lib; };
  commonArgs = { inherit lib pname version src meta passthru; };
in
  if stdenvNoCC.hostPlatform.isDarwin 
  then import ./darwin.nix commonArgs
  else import ./linux.nix commonArgs

Version updates now require editing only version.json. Platform-specific logic is isolated and metadata is reusable across contexts.

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