Enforce repository-wide source size budgets

[ichwars]

Summary

• replace the Python-only size guard with repository-wide budgets for application, test, script, installer, service, and configuration sources
• freeze existing oversized files and Python functions at exact current line counts
• reject empty decorative separator comments in application and tool sources, and remove the existing separators
• run the same guard in CI and pre-commit

Local verification

• Backend: 7517 passed, 245 skipped
• Frontend: 244 files / 2848 tests passed, locale parity passed
• ESLint, TypeScript, Vite production build, Ruff, Actionlint, and source budget passed

[chatgpt-codex-connector]

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