Servy 10.3

• feat(service): add AllowOverriddenRuntimeVars option to allow runtime environment variable expansion (#7411)
• feat(manager): add column visibility toggle and enable column resizing in services table (#7412)
• fix(desktop): move None date rotation option to top of dropdown
• fix(manager): fix console log tailer scroll bottom gap
• ci(loc.yml): switch to cloc for accurate code-only line counts
• docs: add Embedding in Custom Installers guide