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/西红柿豆腐汤羹/西红柿豆腐汤羹.md

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+# How to Make Tomato and Tofu Soup
+
+Tomato and Tofu Soup is a light and delicious dish.
+
+Estimated Cooking Difficulty: ★★
+
+## Ingredients and Tools Required
+
+* Tomatoes
+* Eggs
+* Tofu
+* Cooking oil
+* Salt
+* Cornstarch
+* Chicken bouillon
+* Scallions
+* Ginger
+* Boiling water
+
+## Measurements
+
+Per serving:
+
+* 1 tomato
+* 1 egg
+* 100 g of tofu
+* 5 ml of cooking oil
+* 2 g of salt
+* 5 g of cornstarch
+* 2 g of chicken bouillon
+* 0.5 scallion
+* 1 slice of ginger
+* 350 ml of boiling water
+
+## Instructions
+
+* Dice the tomato, beat the egg in a bowl, and cut the tofu into cubes for later use.
+* Heat the oil in a pot, add the ginger slices, and stir-fry for 5 seconds. Then add the diced tomatoes and stir-fry for 30 seconds.
+* Add boiling water to the pot. Once the soup comes to a boil, pour in the beaten egg and tofu cubes after 60 seconds.
+* After the soup returns to a boil, add the cornstarch slurry and stir gently in one direction for 2 turns.
+* Add chicken bouillon, salt, and scallions. Cook for 30 seconds, then remove from heat.
+
+![Example of the finished dish](./1.jpeg)
+
+## Additional Information
+
+If you encounter any issues or have suggestions for improvement while following this guide, please submit an Issue or Pull Request.