Add investment liquidation UI

[sahilsk11]

Summary

• add liquidationRequestedAt to the active investments API response and v2 API type
• add an expanded-card End Investment section with confirmation modal and disabled Liquidation requested state
• add seeded active/liquidating investment fixtures to cmd/test-api with test auth support for browser verification

Verification

• npm run typecheck
• npm run lint
• npm run build
• go test ./api ./cmd/test-api ./internal/service ./internal/repository -count=1
• go test ./integration-tests -run TestInvestmentLiquidationHTTPFlow -count=1
• browser-verified /investments against cmd/test-api -seed active_investment: expand card, open modal, confirm request, disabled Liquidation requested state on desktop/mobile

Note: broad go test ./... is still not a good verification target after local browser setup because it walks generated local postgres-data/node_modules, and the existing rebalance integration test has a date expectation mismatch against the current clock.

[coderabbitai]

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