Functional Delta: 008-order-management-matcher

Parent state: 007-pricing-awareness-market-data

Document only functional behavior changes introduced by this state.

Added

Order domain with lifecycle states (NEW, PARTIALLY_FILLED, FILLED, CANCELED, REJECTED).
Order matcher component (Java Spring Boot) for evaluating executable orders and publishing fill events.
Order management API surface for create/list/cancel/force-fill workflows.
Database-backed order persistence so active orders survive order-matcher restarts.
Tick-driven auto-fill policy for in-the-money orders:
- remaining quantity < 1000: fill full remaining quantity
- remaining quantity >= 1000: fill half (rounded up)
Trader UI order ticket for limit-order creation, separated from market-trade ticket workflow.
Trader UI account-level open-order blotter (tabbed alongside trade/position context) with user cancel action.
Admin screen (Admin tab) with a filterable order blotter for all accounts and operational force-fill/cancel actions.
Realtime order stream updates for pending/fill/cancel transitions.

Trade submission flow can now originate from direct market trade path or from matched order flow.
Position/trade updates can be sourced from matcher-generated fills in addition to ticket-driven trades.
Order fill path is now explicit: matched order -> trade-service submit -> trade-processor persistence -> position-service update.
UI navigation includes an admin entrypoint for order operations and status visibility.
Trade area adds an order-first interaction path: create limit order, monitor outstanding orders, and cancel from account context.

F2 (submit and process trade): extended to include fill generation from order matching.
F4 (realtime updates): extended with order lifecycle stream topics and admin updates.
New functional flow: F5 (order management and matching lifecycle end-to-end).
New functional flow: F6 (trader order ticket + account orders blotter cancel workflow).