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/鸡蛋花/鸡蛋花.md

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+# How to Make Egg Drop Soup
+
+Egg drop soup is a simple and easy-to-make dish. It is a common home remedy known for moistening the lungs, relieving coughs, and soothing throat discomfort. Beginners can master it after making it once. There are two variations: sweet and savory.
+
+Estimated Cooking Difficulty: ★
+
+## Essential Ingredients and Tools
+
+- Eggs
+- White sugar (optional, for sweet version)
+- Salt (optional, for savory version)
+- Whisk (optional)
+
+## Calculation
+
+Before each preparation, determine how many servings you wish to make. One serving is sufficient for one person.
+
+Per serving:
+
+- 1 egg (approximately 50 g after removing the shell)
+- 100 - 150 ml of boiling water
+- 5 - 10 g of white sugar (if making the sweet version)
+- 1 - 2 g of salt (if making the savory version)
+
+## Instructions
+
+- Crack the egg into a bowl.
+- Using chopsticks or a whisk, beat the egg in one direction until the whites and yolks are fully combined and the color is uniform. (This process takes about 1 - 2 minutes.)
+- Add seasonings such as sugar or salt to the beaten egg and mix slightly.
+- Prepare freshly boiled water at 100 °C.
+- **While rapidly stirring the egg mixture in the bowl with chopsticks, pour the boiling water into the egg in a thin, steady stream.** Ensure the boiling water is thoroughly mixed with the egg.
+- Continue stirring for a moment until the egg is fully cooked by the hot water, forming a uniform pale yellow egg drop soup.
+
+## Additional Notes
+
+- To prevent potential salmonella found in raw eggs, it is recommended to use freshly boiled, 100 °C rolling water to instantly cook the egg mixture completely.
+
+If you encounter any issues or have suggestions for improving the process while following this guide, please submit an Issue or Pull request.