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/meat_dish/洋葱炒猪肉.md

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+# How to Make Stir-Fried Pork with Onions
+
+Salty with a hint of sweetness, easy to prepare, and so delicious you might just eat an extra bowl of rice. It takes only about 15 minutes to complete.
+
+Estimated Cooking Difficulty: ★★★
+
+## Essential Ingredients and Tools
+
+- Onion
+- Pork slices
+- Ketchup
+- Sesame oil
+
+## Measurements
+
+Per serving:
+
+Ingredients
+
+- 1 Onion (the star ingredient; feel free to add half to one more onion if you love onions)
+- Pork (250g)
+- Garlic (3 cloves)
+
+Seasonings
+
+- Cooking oil (15ml)
+- Black pepper (1.25g)
+- Soy sauce (30ml)
+- Sugar (15g)
+- Sesame oil (5ml)
+- Ketchup (15ml)
+- Cooking wine (15ml)
+
+Note: Consider purchasing [teaspoons and tablespoons](https://www.sohu.com/a/127293243_570657) for precise measurement.
+
+## Instructions
+
+- Slice the onion, crush the pork and garlic, and mix the seasonings in advance.
+- Pour 1 tablespoon of cooking oil into a wok (wait 10 seconds for the oil to heat up), then add the pork.
+- Stir-fry until the pork changes color, then add the garlic and stir-fry until fragrant. Remove and set aside.
+- In the same wok, stir-fry the onion for 3–4 minutes, then add the seasonings and mix well.
+- Add the reserved pork back into the wok and stir-fry until cooked through.
+- Continue stir-frying for another 1–2 minutes after the pork is cooked, then serve.
+
+## Additional Notes
+
+- You can choose pork shoulder slices or pre-cut pork strips based on your preference.
+
+### References
+
+- [iCook](https://icook.tw/)
+
+If you encounter any issues or have suggestions for improvement while following this guide, please submit an Issue or Pull request.