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/vegetable_dish/西葫芦炒鸡蛋/西葫芦炒鸡蛋.md

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+# How to Make Stir-Fried Zucchini with Eggs
+
+![Stir-Fried Zucchini with Eggs](./西葫芦炒鸡蛋.jpeg)
+
+Stir-fried zucchini with eggs is a simple and easy-to-make home-cooked dish. With simple and readily available ingredients, it is delicious and goes well with rice.
+
+Estimated Cooking Difficulty: ★★
+
+## Required Ingredients and Tools
+
+- Zucchini
+- Eggs
+- Tomatoes (optional)
+- Table salt
+- Cooking oil
+
+## Quantities
+
+For 2 servings:
+
+- Zucchini 500g
+- Tomatoes 100g
+- Eggs 3
+- Cooking oil 10-20ml
+- Table salt 6g
+
+## Instructions
+
+- Wash the tomatoes and cut them into small pieces; set aside.
+- Wash the zucchini and cut it into diamond shapes with sides approximately 4cm long; set aside.
+- Crack three eggs into a bowl, beat them until well mixed, and set aside.
+- Heat the pan and add 5ml - 10ml of cooking oil.
+- Pour in the eggs and stir-fry until they solidify. Use a spatula to break them into small pieces, then transfer them to a bowl and set aside.
+- Add 5ml - 10ml of cooking oil to the pan, pour in the tomatoes, and stir-fry until they soften.
+- Add the zucchini and stir-fry evenly. Add 6g of table salt, reduce the heat, and **wait for 4 - 5 minutes**.
+- Add the reserved eggs back to the pan and stir-fry over medium heat for 15 seconds.
+- Turn off the heat and serve.
+
+## Additional Notes
+
+If you encounter any issues or have suggestions for improvement while following this guide, please submit an Issue or Pull request.