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/蚝油生菜.md

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+
+# How to Make Oyster Sauce Lettuce
+
+Estimated Cooking Difficulty: ★★
+
+## Essential Ingredients and Tools
+
+- Lettuce
+- Oyster sauce
+- Garlic
+- Light soy sauce
+- Salt
+- White sugar
+- Cooking oil
+
+## Measurements
+
+The portion size for this dish is the same as the standard portion ordered at a Sichuan restaurant.
+
+- Lettuce: 1 head (200 g ± 50 g)
+- Oyster sauce: 6-8 ml
+- Garlic: 4-5 cloves (mashed or finely chopped)
+- Light soy sauce: 6 ml
+- Salt: 0.5 g
+- White sugar: 1 g
+- Cooking oil: 5-8 ml
+
+## Instructions
+
+- Wash the lettuce and remove any wilted leaves.
+- Heat a wok, add 1 L of cold water, then add 2-3 ml of cooking oil and 0.5 g of salt. Wait for the water to boil.
+- Once the water is boiling, add the lettuce and blanch **each** leaf for 10 seconds.
+- Remove the lettuce, drain the water, and plate it.
+- Prepare the sauce: Mix 10 ml of light soy sauce, 6-8 ml of oyster sauce, 0.5 g of salt, and 1 g of white sugar in a bowl. Add 10-15 ml of cold water and stir well.
+- Heat the wok again, add 5-8 ml of cooking oil, and add the minced garlic when the oil is hot.
+- Wait until the garlic aroma is released, pour in the prepared sauce, bring to a boil, and immediately turn off the heat.
+- Evenly **pour** the sauce over the lettuce.
+
+## Additional Notes
+
+This dish is rich in vitamins, easy to make, and tastes refreshing without causing internal heat.
+
+If you encounter any issues or have suggestions for improvement while following this guide, please submit an Issue or Pull request.