Add locale-aware number/currency/date parsing

[JE-Chen]

Dependency-gated batch (approved under 批准全部). Full layers + tests + EN/Zh v43 docs + README.

Feature (utils/locale_parse, optional babel)

• parse_decimal / parse_number (locale strings -> float/int, e.g. "1.234,56" de_DE -> 1234.56), format_decimal / format_currency (ISO 4217) / format_date (ISO string or date -> short/medium/long/full). Uses Babel CLDR data so OCR/UI text parses and formats correctly across locales.
• babel is an optional [locale] extra, imported lazily — the package stays importable without it and a clear error is raised only when a function is called without Babel. Functional tests run under importorskip; wiring/facade always verified.
• Executor AC_parse_decimal / AC_parse_number / AC_format_decimal / AC_format_currency / AC_format_date; MCP ac_*; Builder under Data.

Verification

• 8 tests pass (parse de_DE/en_US, parse_number, format decimal/currency, format_date short, de_DE round-trip, executor round-trip, wiring, facade) — functional ones under importorskip(babel); ruff clean; radon no CC≥C; bandit clean; PySide6-free.
• Stacked on image-dedup (Add perceptual-hash image dedupe #250); rebased cleanly onto dev.

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 29 complexity · 0 duplication

Metric	Results
Complexity	29
Duplication	0

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud