Add scheduled investment liquidation

[sahilsk11]

Adds POST /investments/:investmentID/request-liquidation, an authenticated and idempotent request to liquidate an investment at the next rebalance.

The rebalancer targets cash-only holdings for requested liquidations, reuses the existing aggregated order flow, and marks the investment ended only after fills leave it with no stock positions. Paused investments with liquidation requests remain eligible so they cannot get stuck.

Includes migration 59, regenerated DB models and repository mocks, ownership checks, and lifecycle tests. Repository updates use Go Jet throughout.

Verification: ALPHA_ENV=test go test ./...; go build ./...; generated DB models regenerated from the migrated local Postgres schema.

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