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/溏心蛋.md

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+# How to Make Soft-Boiled Eggs
+
+Fitness enthusiasts can get about 6 grams of protein per egg. The preparation takes approximately 15 minutes.
+
+Estimated Cooking Difficulty: ★★★
+
+## Required Ingredients and Tools
+
+- Eggs
+- Electric cooker
+- Water
+- Stopwatch (optional)
+
+## Quantities
+
+- 1 or more eggs (as many as your electric cooker can hold)
+- Cold water covering the eggs by about 2 cm
+
+## Instructions
+
+- Place the eggs in the electric cooker. Do not stack the eggs; they should all sit at the bottom with some space to move around.
+- Pour in cold water until it covers the eggs by about 2 cm.
+- Leave the lid open and heat on maximum power until the water reaches 85–95°C (slightly simmering, not fully boiling).
+- Turn off the heat, cover the lid, and let the eggs sit.
+  - For a runny yolk center, let sit for 6 minutes.
+  - For a fully set, crumbly yolk, let sit for 10 minutes.
+- Drain the water and rinse the eggs under cold water for about 1 minute to cool them down, then peel and serve.
+
+## Additional Notes
+
+If you prefer your eggs more well-done, you can add more water according to your taste.
+
+**Warning** Soft-boiled eggs carry a risk of Salmonella infection. It is not recommended to let them sit for less than 5 minutes.
+
+If you encounter any issues or have suggestions for improvement while following this guide, please submit an Issue or Pull request.