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/凉拌油麦菜.md

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+# How to Make Cold-Seasoned Indian Lettuce
+
+Estimated Cooking Difficulty: ★
+
+## Essential Ingredients and Tools
+
+* Indian Lettuce
+* Sesame Paste
+* Soy Sauce
+* Vinegar
+* Oyster Sauce
+* White Sugar
+* Sesame Oil
+* Garlic
+* Salt
+
+## Calculation
+
+Before each preparation, determine how many servings you wish to make. One serving is sufficient for 1-2 people.
+
+Total Quantity:
+
+* 1 head of Indian Lettuce (approx. 200g) * Number of Servings
+* 15ml Vinegar * Number of Servings
+* 5ml Soy Sauce * Number of Servings
+* 10ml Sesame Paste * Number of Servings
+* 5ml Sesame Oil * Number of Servings
+* 5g Sugar * Number of Servings
+* 10ml Oyster Sauce * Number of Servings
+* 2 cloves of Garlic * Number of Servings
+
+## Instructions
+
+* Smash and mince the garlic
+* Combine vinegar, soy sauce, sesame paste, sesame oil, sugar, oyster sauce, and minced garlic in a bowl and stir well
+* Cut the Indian Lettuce into segments, each no longer than 4cm
+* Place the Indian Lettuce in a large bowl, pour the prepared sauce over it, and mix thoroughly.
+
+## Additional Notes
+
+* Peanut butter can be used as a substitute for sesame paste.
+* Ensure the sesame paste is thoroughly mixed with the Indian Lettuce for the best flavor.
+
+If you encounter any issues or have suggestions for improvement while following this guide, please submit an Issue or Pull request.