Test investment liquidation lifecycle

[sahilsk11]

Adds an end-to-end HTTP integration test for the investment liquidation lifecycle against a migrated temporary Postgres database and a stateful fake Alpaca broker.

The test verifies ownership rejection, idempotent liquidation requests, exact full-position sell orders, pending state before fills, fill reconciliation into cash-only holdings, investment completion, active-list removal, and no duplicate orders on later rebalances.

The integration harness now accepts an injectable identity middleware and broker. Its price fake also returns only requested symbols, matching the production provider contract.

Verification:

• go test ./integration-tests -run TestInvestmentLiquidationHTTPFlow -count=1
• go test -race ./integration-tests -run TestInvestmentLiquidationHTTPFlow -count=1
• ALPHA_ENV=test go test ./integration-tests -count=1
• ALPHA_ENV=test go test ./...
• go build ./...

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