fix(swap): remove --open-price parameter and update docs with cooking/limit order examples

- Remove --open-price option from swap order strategy create command
- Remove open_price field from OpenApiClient StrategyCreateParams type
- Update skills/gmgn-swap/SKILL.md: drop open-price row and inference table, simplify examples to use --sub-order-type directly
- Update docs/cli-usage.md: remove --open-price from command signature and parameter table
- Add /gmgn-cooking skill to Skills tables in Readme.md and Readme.zh.md
- Add limit order and cooking CLI examples to section 8 of both readmes
- Update Cline install instructions to include /gmgn-cooking

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docs/cli-usage.md

@@ -483,7 +483,6 @@ gmgn-cli order strategy create \
   --order-type <limit_order> \
   --sub-order-type <buy_low|buy_high|stop_loss|take_profit> \
   --check-price <price> \
-  [--open-price <price>] \
   [--amount-in <amount> | --amount-in-percent <pct>] \
   [--slippage <n> | --auto-slippage] \
   [--limit-price-mode <exact|slippage>] \
@@ -505,7 +504,6 @@ gmgn-cli order strategy create \
 | `--order-type` | Yes | Order type: `limit_order` |
 | `--sub-order-type` | Yes | Sub-order type: `buy_low` / `buy_high` / `stop_loss` / `take_profit` |
 | `--check-price` | Yes | Trigger check price |
-| `--open-price` | No | Open/entry price |
 | `--amount-in` | No* | Input amount (smallest unit); required unless `--amount-in-percent` is used |
 | `--amount-in-percent` | No* | Input as percentage (e.g. `50` = 50%); required unless `--amount-in` is used |
 | `--limit-price-mode` | No | `exact` / `slippage` (default: `slippage`) |