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/staple/烧饼/芝麻烧饼.md

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+# How to Make Sesame Seed Cakes
+
+![Example finished dish](./芝麻烧饼.jpg)
+Sesame seed cakes are crispy on the outside, soft on the inside, and easy to make.
+
+Estimated Cooking Difficulty: ★★★
+
+## Essential Ingredients and Tools
+
+- Flour
+- Yeast powder
+- White sugar
+- Shixiang (thirteen-spice seasoning)
+- Cooking oil
+- Warm water (40℃)
+
+## Calculation
+
+The recipe ingredients are sufficient for 7 cakes.
+
+## Instructions
+
+- Dough: 300g flour, 3g yeast powder, 3g white sugar, 180g warm water, 20g cooking oil. Let the dough rest for 10 minutes.
+- Oil paste: In a small bowl, mix 30g flour, 2g salt, 4g Shixiang, and 20g cooking oil. Stir well and let it sit.
+- Making the cakes: Roll the dough into a rectangle, spread the prepared oil paste over it, roll it up from one end, and cut into 7 equal pieces. Fold each piece in half, pinch the edges tightly with your thumb and forefinger, dip one side in water, then coat it with white sesame seeds, and roll into a small round cake.
+- Cooking: Preheat the electric griddle, pour in cold oil (cover the bottom completely), place the rolled cakes in the griddle, brush a little oil on top, spread evenly, cover the lid, select the "Large Cake" setting, and remove when it beeps.
+
+## Additional Notes
+
+- If you don't have an electric griddle, you can use a frying pan instead.
+- If you don't have sesame seeds, you can skip them; it will still taste delicious.
+
+If you encounter any issues or have suggestions for improvement while following this guide, please submit an Issue or Pull request.