feat(longbridge-cli): add order rejection diagnosis reference + price adjustment

- 港股 9 档保护规则 (买入价不得高于卖1价 9档 / 低于买1价 24档)
- 长桥 CLI/SDK 不返回拒绝原因, 需查 App 或客服
- helper 新增 get_depth() + adjust_price_for_order()
- hk_intraday_cli.py 自动调整价格到合法范围
- 实测: 9988.HK 112.70 → 调整到 ask1 108.00 → 下单成功

Co-Authored-By: Claude <noreply@anthropic.com>

longbridge-python-sdk/SKILL.md

@@ -280,6 +280,35 @@ for ch in positions.channels:
 
 For full API surface, see `references/api-reference.md`.
 
+## Python SDK still works for read-only — for orders, use the CLI helper
+
+As of 2026-07-09, `submit_order()` and `cancel_order()` from the Python SDK still hit 602315 even with the full three-piece recipe. The verified path is the **CLI** (one-off manual orders). For Python code that needs to actually place orders, use `scripts/longbridge_cli_helper.py` in the `longbridge-cli` skill — it provides SDK-shaped functions (`account_balance`, `stock_positions`, `submit_order`, `cancel_order`, `OrderType` / `OrderSide` / `TimeInForceType` enums) that internally shell out to the CLI binary. Pattern:
+
+```python
+# In any Python script that needs to trade:
+import sys
+sys.path.insert(0, '/home/openclaw/.hermes/scripts')
+import longbridge_cli_helper as _helper
+# Inject as fake 'longport' module so existing code can keep importing
+fake = type(sys)('longport')
+fake.openapi = _helper
+sys.modules['longport'] = fake
+sys.modules['longport.openapi'] = _helper
+from longport import openapi  # now openapi is the CLI-backed helper
+
+# All SDK-shaped calls work and route to CLI:
+ctx = openapi.QuoteContext(config=None)  # Yahoo Finance fallback for quotes
+bals = openapi.account_balance()         # via longbridge balance
+positions = openapi.stock_positions()     # via longbridge positions
+resp = openapi.submit_order(              # via longbridge buy --profile lb_real
+    symbol="RGTI.US", order_type=openapi.OrderType.LO,
+    side=openapi.OrderSide.Buy, submitted_quantity=1, time_in_force=openapi.TimeInForceType.Day,
+    submitted_price=15.40,
+)
+```
+
+This is the migration path for any cron script that used to call `trade_ctx.submit_order()` directly. **Read operations** (quote, candlesticks, balance, positions) still work fine through the Python SDK — keep them. Only the order placement needs the helper.
+
 ## Common Pitfalls
 ## Valuation Metrics (calc_indexes)