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/aquatic/葱烧海参/葱烧海参.md

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+# How to Make Scallion Braised Sea Cucumber
+
+![Finished Dish](./葱烧海参.jpeg)
+
+This dish is not difficult to prepare, but rehydrating the dried sea cucumber takes time. During the pandemic lockdown at home, I decided to use the dried sea cucumber I had stocked up before the Lunar New Year.
+
+Estimated Cooking Difficulty: ★★★
+
+## Ingredients and Tools
+
+- Rehydrated sea cucumber![Sea Cucumber](./海参.jpeg)
+- White part of the scallion (scallion whites)
+
+## Ingredients per Serving
+
+- Rehydrated sea cucumber (Arctic sea cucumber) 4 pieces
+- White part of one large scallion (just the white part)
+- Cooking oil 20-25ml
+- Oyster sauce 20g
+- Light soy sauce 5g
+- Sugar 2g
+- Cornstarch 2g
+
+## Instructions
+
+- Cut the scallion whites into 1cm segments and set aside.
+- Cut the sea cucumber into 1cm segments and set aside.
+- In a small bowl, mix 20g of oyster sauce, 10g of light soy sauce, and 2g of sugar. Stir well.![Sauce](./酱汁.jpeg)
+- In another small bowl, mix cornstarch with a little water to prepare a slurry for thickening.
+- Heat a wok or pan and add 20ml - 25ml of cooking oil. Wait about 10 seconds for the oil temperature to rise.
+- Add the scallion whites, reduce heat to *low*, and be careful not to burn them. Fry for about 3-5 minutes.![Scallion Whites](./葱白.jpeg)
+- Remove the scallion whites with chopsticks and set them aside on a plate.
+- Pour in the prepared sauce, stir-fry until fragrant, and **wait for 1 - 2 minutes**.
+- Add the cut sea cucumber and stir-fry for 1 minute.
+- Add 100ml of water, reduce heat to medium-low, and **wait for 5 minutes**.
+- When the sauce in the pan is almost dry, add the cornstarch slurry and the reserved scallion whites.
+- Once the dish reaches a *viscous consistency*, turn off the heat and serve.![Finished Dish](./葱烧海参.jpeg)
+
+## Additional Notes
+
+- While cooking, keep an eye on the amount of liquid in the pan. If it dries up too quickly, you can add the cornstarch slurry directly.
+
+If you encounter any issues or have suggestions for improvement while following this guide, please submit an Issue or Pull request.