spec-price-fetching

New issue

Price-fetching premium feature: client-side scaffolding (Tauri command + service + UI + i18n) + production wiring after maximus-api prices-proxy is live. Contract: docs/api-contract-prices.md. ADR: docs/adr/0011-providers-best-effort-yahoo.md. Replaces former spec-bilan (which was already 7/7 done in overnight-2026-04-26-bilan).

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