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Adds Provider::TinkoffInvest, a token-based securities provider built on the public T-Invest REST gateway (invest-public-api.tinkoff.ru/rest). It serves prices for Russian instruments (shares, ETF/БПИФ, bonds) and, crucially, brand logos via the T-Invest CDN — the authoritative logo source for MOEX instruments, which ISS (MoexPublic) does not provide. - Registry: register `tinkoff_invest` under the :securities concept; token via ENV TINKOFF_INVEST_API_KEY or encrypted Setting.tinkoff_invest_api_key. - Logos independent of the price provider: Security#import_brand_logo consults T-Invest for a logo whenever a token is configured (after the price-provider metadata fetch, so it never short-circuits website_url backfill). Gated on token presence, not the securities checklist. - display_logo_url: with no website domain, a stored provider logo (T-Invest) now beats the ticker-only Brandfetch lettermark; when a domain exists, Brandfetch still wins (unchanged). - MoexPublic no longer reports moex.com as the issuer website — it's the exchange, not the issuer, and would make Brandfetch render the exchange logo for every instrument and shadow the real brand logo. - Prices: GetCandles (daily, paged) + GetLastPrices; Quotation units+nano/1e9; bonds priced as percent-of-par x nominal (missing nominal raises, not 0). - Settings: encrypted token field (always shown) + provider checkbox + en locale. - Tests for search/info/logo-url/prices/bond/incomplete-candle and display logic. Co-authored-by: Claude <noreply@anthropic.com>