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/素炒豆角.md

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+# How to Make Stir-Fried Green Beans
+
+A home-style dish that goes perfectly with rice.
+
+Estimated Cooking Difficulty: ★★
+
+## Essential Ingredients and Tools
+
+- Green beans
+- Millet peppers (small red chilies)
+- Green onion
+- Garlic
+- Light soy sauce
+- Dark soy sauce
+- Oyster sauce
+- Salt
+
+## Quantities
+
+Note: Due to variations in ingredients, this recipe is for 2 servings.
+
+- Green beans: 250g
+- Millet peppers: 2 pieces
+- Green onion: 3 rings
+- Garlic: 2 cloves
+- Light soy sauce: 6ml
+- Dark soy sauce: 2ml
+- Oyster sauce: 6ml
+- Salt: 6g
+
+## Instructions
+
+- Cut the green onion into rings and mince the garlic; set aside.
+- Mix the light soy sauce, dark soy sauce, oyster sauce, and salt to create the sauce; set aside.
+- Slice the millet peppers into rings; set aside.
+- Remove the strings from the green beans, then cut them diagonally into small pieces, 4-10cm long; set aside.
+- Heat oil (10ml - 15ml) in a pan. Once it starts to smoke, add the green onion and millet peppers, and stir-fry until fragrant.
+- Add the green beans and stir-fry for 30 seconds.
+- Pour in the prepared sauce and stir-fry on high heat for 2 minutes.
+- Add 150ml of water.
+- Reduce heat to medium-low, cover the pan, and simmer for 8-10 minutes.
+- Add the minced garlic before serving.
+
+## Additional Notes
+
+- Cutting green beans requires some knife skills; if you are not comfortable with it, you can use kitchen scissors instead.
+
+If you encounter any issues or have suggestions for improvement while following this guide, please submit an Issue or Pull request.