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/breakfast/美式炒蛋.md

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+
+# How to Make American-Style Scrambled Eggs
+
+American-style scrambled eggs have a soft and tender texture. Unlike regular scrambled eggs, a small amount of milk is added to create finer, more uniform curds, while also boosting nutritional value.
+
+Estimated Cooking Difficulty: ★★
+
+## Essential Ingredients and Tools
+
+- Eggs
+- Whole milk or cream
+- Butter
+- Salt
+
+## Measurements
+
+Per serving:
+
+- 3 eggs
+- 10g whole milk or cream
+- 5g butter
+- 1g salt
+
+## Instructions
+
+- Crack the eggs into a large bowl, add salt, and whisk until frothy. Let it rest for 15 minutes.
+- Cut the butter into small pieces and add them to a pan. Pour in the egg mixture and cook over low heat, stirring constantly.
+- Once the butter melts, quickly stir the eggs to break them into fine curds. Turn off the heat before the eggs are fully set.
+- Stir in the milk for 15 seconds until the eggs are moist and creamy, then serve.
+
+## Additional Tips
+
+- For a richer dish, add sautéed diced tomatoes, onions, bacon, or small cubes of cheese at the end. (Use ingredients that won't release excess moisture.)
+- Use a frying pan (preferably non-stick).
+- Since many people cook for one or two servings, a smaller pan may make it easier to stir evenly.
+
+If you encounter any issues or have suggestions for improvement while following this guide, please submit an Issue or Pull Request.