Expose investment liquidation lifecycle

[sahilsk11]

Summary

• add an authenticated GET /investments endpoint that includes active and ended investments
• expose status and endDate while preserving /activeInvestments compatibility
• derive ACTIVE, LIQUIDATION_REQUESTED, LIQUIDATING, and LIQUIDATED from existing investment and trade data
• extend the HTTP/database liquidation test through request, pending broker orders, fills, and history retention

Design

Completed investments remain soft-ended through the existing investment.end_date; no archive table or migration is introduced. The frontend can treat ended records from /investments as its Past Investments section.

Verification

• go test ./api ./internal/repository ./internal/service -count=1
• go test ./integration-tests -run TestInvestmentLiquidationHTTPFlow -count=1
• ALPHA_ENV=test go test ./... -count=1
• git diff --check

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