feat: add order management foundation

[ichwars]

Summary

• add business profiles, customer master data, permissions, APIs, navigation, and settings workspaces
• add transactional per-profile numbering with SQLite/PostgreSQL concurrency safeguards
• add pinned Unicode 15.1 normalization, international master data, localization, and operator documentation

Verification

• 117 focused backend tests passed
• 85 focused frontend tests passed
• Ruff, ESLint, i18n parity, generated-source check, production build, and git diff checks passed
• 1,114,112 Unicode code points compared with 0 mismatches
• independent backend and frontend re-reviews approved

Residual

• Docker image build was not run because the local Docker engine was unavailable

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Install Unicode backport on Python 3.14+

When installing PrintOps under Python 3.14+ (still allowed by pyproject.toml's >=3.10), this marker skips unicodedata2; Python 3.14's stdlib unicodedata uses Unicode 16.0.0, so backend/app/core/text_normalization._select_unicode_provider raises RuntimeError because it requires 15.1.0, preventing app startup as soon as the new order models are imported. Keep the backport installed unless the stdlib is known to be 15.1, or cap the supported Python version.

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