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/soup/番茄牛肉蛋花汤.md

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+# Tomato Beef Egg Drop Soup Recipe
+
+Estimated Cooking Difficulty: ★★★
+
+## Essential Ingredients and Tools
+
+- Beef
+- Tomato
+- Egg
+- Green onion, ginger, garlic
+- Salt
+- Pepper
+
+## Calculations
+
+- Beef: 150 g per person
+- Tomato: 1 per person
+- Egg: 1 per person
+- Salt: 2 g per person
+- Pepper: 0.5 g per person
+
+Using the above conditions, calculate the proportion of raw materials to be used.
+
+## Instructions
+
+### Preparing the Ingredients
+
+- Slice the beef into thin pieces
+- Cut the tomato into small chunks
+- Chop the green onion into scallions
+- Slice the ginger into thin slices
+- Mince the garlic into garlic paste
+
+### Pre-treating the Beef
+
+- Place the beef in a bowl
+- Add salt and pepper, and marinate for 15-20 minutes
+
+### Cooking the Soup
+
+- Bring water to a boil
+- Add ginger slices and beef slices, and cook until the beef changes color
+- Add tomato chunks, and cook until the tomatoes soften
+- Beat the egg and slowly pour it into the pot, stirring with chopsticks to form egg ribbons
+- Season with salt and pepper
+- Finally, add chopped scallions and serve
+
+## Additional Notes
+
+- You can add a little vinegar or sugar to taste to adjust the flavor
+- If you prefer spicy food, you can add chili or chili sauce for seasoning
+
+If you encounter any issues or have suggestions for improvement while following this guide, please submit an Issue or Pull request.