Add English translations for all 379 recipe and tip files

Use dotlang AI translation (aiursoft-instruct:latest via Ollama) to
translate all Chinese content to English under en/ subfolder:
- en/dishes/: all recipe categories (aquatic, breakfast, condiment,
  dessert, drink, meat_dish, semi-finished, soup, staple, vegetable_dish)
- en/tips/: learn/ and advanced/ cooking guides
- en/README.md, en/CONTRIBUTING.md, en/CODE_OF_CONDUCT.md

The mkdocs-static-i18n plugin (docs_structure: folder) serves Chinese
at the root and English at /en/, with a language switcher in the UI.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

en/dishes/staple/韭菜盒子.md

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+# How to Make Leek Pockets
+
+Leek pockets are a delicious traditional snack, featuring a crispy outer crust and a savory filling rich in vitamins and protein. They are simple to make and perfect for lunch, with an estimated preparation time of about 2.5 hours.
+
+Estimated Cooking Difficulty: ★★★
+
+## Essential Ingredients and Tools
+
+- Leeks
+- Shrimp
+- Eggs
+- Sesame oil
+- Salt
+- Flour
+
+## Calculation
+
+Before each preparation, determine how many servings you want to make. One serving is sufficient for 2 people.
+
+Per serving:
+
+- Leeks: 500g
+- Shrimp: 100g
+- Eggs: 3
+- Sesame oil: 10ml
+- Salt: 5g
+- Flour: 250g
+
+## Instructions
+
+- Place the flour in a large bowl, add water, and mix to form a smooth dough. Let it rest for 30 minutes.
+- Wash and finely chop the leeks. Add the beaten eggs and 5g of salt, then mix well.
+- Divide the dough into small portions, roll each into a thin round disc, and fill with the leek, shrimp, and egg mixture.
+- Heat a pan with cooking oil, place the filled leek pockets in the pan, and fry until golden brown on both sides, approximately 3-4 minutes.
+- Transfer to a plate and let cool slightly before serving.
+
+## Additional Notes
+
+- You can add ingredients such as dried tofu according to your personal taste.
+- Pay attention to the heat while frying to avoid burning the outside while the inside remains undercooked.
+
+If you encounter any issues or have suggestions for improvement while following this guide, please submit an Issue or Pull request.