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/鸡蛋羹/蒸箱鸡蛋羹.md

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+# Steamed Egg Custard Recipe
+
+Steamed Egg Custard is a simple, quick, and easy dish to prepare, with a cooking time of approximately 15 minutes. It is suitable for chefs with a home steam oven.
+
+Estimated Cooking Difficulty: ★★★
+
+## Essential Ingredients and Tools
+
+- Eggs
+- Table salt
+- Cooking oil
+- Light soy sauce (optional)
+- Steam oven
+
+## Measurements
+
+For 1 serving:
+
+- 1 egg
+- 1g table salt
+- 5ml cooking oil
+- 6ml light soy sauce / Weijixian (optional seasoning)
+
+## Instructions
+
+- Crack one egg into a bowl and beat it well.
+- Add purified water at 60°C, 1.0-1.5 times the volume of the egg, and mix well.
+  - Less water within the correct range results in a firmer texture, while more water results in a softer texture.
+  - Note: Outside the recommended range, too little water makes the texture too firm, and too much water makes it too watery.
+- Add 1g of table salt.
+  - Salt plays a crucial role in enhancing the base flavor and aiding coagulation.
+- Add 5ml of cooking oil.
+- Strain the egg mixture to remove foam (optional; skipping this step may result in an unappealing appearance due to air bubbles).
+- Ensure the steam oven's water tank is sufficiently filled (if unsure, fill the tank completely).
+- Place the bowl containing the thoroughly mixed egg mixture into the steam oven.
+- Set the temperature to **100°C** and steam for **10 minutes**.
+- Open the steam oven (Caution: Steam may be released instantly upon opening; open slowly).
+- Serve (you may add light soy sauce for seasoning).
+- Enjoy.
+
+## Additional Notes
+
+If you encounter any issues or have suggestions for improvement while following this guide, please submit an Issue or Pull request.