v1.7.0 — Multi-currency portfolio accounting

OpenTerminalUI v1.7.0 — Multi-currency portfolio accounting

v1.7.0 completes the v1 arc with one explicit reporting base for mixed-market
portfolios. Current values, dated ledger activity, P&L, allocations, risk
history, benchmark comparison, and return attribution now use traceable FX
evidence or expose an actionable partial/degraded state instead of combining
incompatible currencies.

Highlights

• Adds base-currency historical portfolio analytics with batched dated FX,
  explicit open-holdings methodology, and exact security/FX/interaction return
  attribution.
• Unifies portfolio list, detail, Manager analytics, dashboards, allocations,
  and reports on the shared backend accounting contract.
• Persists explicit portfolio, holding-cost, transaction-amount, and fee
  currencies through the additive 0014 migration without guessing legacy
  denominations.
• Adds traceable current and historical FX lookup with provider, timestamp,
  freshness, cache, and degraded-state evidence.
• Lets owners repair unknown legacy currencies per row through focused Portfolio
  Manager actions and dialogs.
• Keeps totals unavailable when required quote, date, denomination, or FX
  evidence is missing; parity and fabricated substitutes are never assumed.

Upgrade notes

• Apply database migrations through revision 0014 before starting the updated
  backend.
• Existing legacy currency fields intentionally remain nullable. Review any
  “currency unknown” rows in Portfolio Manager and use Set currency to record
  the original denomination.
• Historical portfolio analytics describe the current open basket from the date
  the complete retained basket existed; they are not a closed-position or
  cash-flow-adjusted performance reconstruction.

Full details are available in CHANGELOG.md and the v1.7 verification ledger in
docs/wiki/Releasing.md.