[Roadmap] Auditable AI entry decision filters

[brokermr810]

Outcome

Add an optional, auditable AI decision gate immediately before ordinary strategy and Quick Trade entry orders.

Delivered

• Live deployment opt-in for ordinary strategies; grid, DCA, and Martingale remain excluded.
• Quick Trade opt-in with the same decision contract.
• Decision Context V2 includes signal, multi-timeframe market evidence, exposure, equity, drawdown, recent outcomes, and execution constraints.
• JEV is the primary provider when configured, with LLM fallback and fail-open behavior when neither provider returns a valid decision.
• Provider output converges to exactly pass or reject; malformed, low-confidence, timeout, and provider errors follow deterministic fallback rules.
• Exit and risk-reduction orders bypass AI so provider outages cannot trap positions.
• Rejections and provider reasoning are persisted and visible in the live strategy and Quick Trade interfaces.
• Dark/light themes, English/Chinese copy, tests, and public README diagrams are included.

Implementation

• Backend: b800a01 (feat: add auditable AI decision filtering)
• Frontend: 68e7bb8 (feat: surface AI decision filtering controls)

The remaining point-in-time external factor ingestion and backtest contract continue in #256.