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/炒青菜.md

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+# How to Stir-fry Green Vegetables
+
+Easy and convenient to make. Estimated time: 10 minutes.
+
+Estimated Cooking Difficulty: ★★
+
+## Essential Ingredients and Tools
+
+- Green vegetables
+
+## Calculations
+
+Before each preparation, determine how many servings you want to make. One serving is sufficient for 1 person.
+
+Total Quantity:
+
+- Green vegetables: 100g * number of servings
+- Garlic cloves: 2 cloves * number of servings
+- Cooking oil: 10-15ml (enough to coat the bottom of the pan)
+- Salt: 2g * number of servings
+- Water: 70ml * number of servings
+- Sugar: 5g * number of servings
+
+## Instructions
+
+- Break the green vegetables into smaller pieces, wash them with clean water, and set aside.
+- Mince the garlic cloves and set aside.
+- Heat the pan over medium-high heat and add 10-15ml of cooking oil. Wait for 30 seconds to let the oil temperature rise.
+- Add the prepared green vegetables to the pan and stir-fry until they soften (about 1 minute).
+- Add the minced garlic.
+- Pour in the calculated amount of water. The water level should fully cover or nearly cover the vegetables. Add salt (2g * number of servings) and continue stir-frying for about 1 minute.
+- Finally, add sugar, reduce the heat to low, cover the pan, and heat for 2 minutes.
+- Serve on a plate.
+
+## Additional Notes
+
+Adding sugar helps keep the green vegetables vibrant in color.
+
+If you encounter any issues or have suggestions for improvement while following this guide, please submit an Issue or Pull request.