feat(hub): add AI coach page with daily summary and chat

Aggregate four-account trades via hub_ai module and /api/hub/trades/today; store sessions in JSON; default OpenAI config matches instances.

Co-authored-by: Cursor <cursoragent@cursor.com>

manual_trading_hub/hub_ai/client.py

@@ -0,0 +1,20 @@
+"""中控 AI 模型调用（共用 ai_client 配置，逻辑独立）。"""
+from __future__ import annotations
+
+import sys
+from pathlib import Path
+
+_REPO_ROOT = Path(__file__).resolve().parents[2]
+if str(_REPO_ROOT) not in sys.path:
+    sys.path.insert(0, str(_REPO_ROOT))
+
+from ai_client import ai_generate, ai_provider_label  # noqa: E402
+
+
+def model_label() -> str:
+    return ai_provider_label()
+
+
+def generate_text(*, system: str, user: str, temperature: float) -> str:
+    prompt = f"{system.strip()}\n\n---\n\n{user.strip()}"
+    return ai_generate(prompt, temperature=temperature)