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/洋葱炒鸡蛋/洋葱炒鸡蛋.md

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+# Recipe for Scrambled Eggs with Onions
+
+Scrambled eggs with onions is a well-known everyday dish in China.
+
+Estimated cooking difficulty: ★★
+
+## Essential Ingredients and Tools
+
+* Eggs
+* Onion
+* Cooking oil
+* Salt
+* Scallion
+* Cooking wine
+
+## Measurements
+
+Per serving:
+
+* 2 eggs
+* 50 g onion
+* 50 ml cooking oil
+* 2 g salt
+* 1/2 scallion
+* 2 ml cooking wine
+
+## Instructions
+
+* Crack the eggs into a large bowl, add the onion slices and salt, then stir for 60 seconds.
+* Heat oil in a pan, pour in the egg mixture, and fry one side for 30-45 seconds. Flip and continue stir-frying for another 2-3 minutes. Sprinkle with cooking wine before removing from the pan.
+* Plate the eggs and garnish with chopped scallions.
+
+![Example finished dish](./1.jpeg)
+
+## Additional Information
+
+If you encounter any issues or have suggestions for improvement while following this guide, please submit an Issue or Pull Request.