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/凉拌黄瓜.md

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+# How to Make Cold Cucumber Salad
+
+Estimated Cooking Difficulty: ★
+
+## Essential Ingredients and Tools
+
+* Cucumber
+* Vinegar
+* Soy Sauce
+* Garlic
+
+## Calculation
+
+Determine how many servings you want to make before each preparation. One serving is sufficient for 1 person.
+
+Total Amount:
+
+* Cucumber: 200 g × Number of servings
+* Vinegar: 7.5 ml + (4 ml × Number of servings)
+* Soy Sauce: 5 ml + (2.5 ml × Number of servings)
+* Garlic: 3 cloves × Number of servings
+* Salt: 0.4 g + (0.2 g × Number of servings)
+* Sesame Oil: 5 ml + (2 ml × Number of servings)
+* Oyster Sauce: 5 ml
+
+## Instructions
+
+* Use a kitchen knife to flatten the cucumber, then chop it into 3 cm pieces.
+* Place the chopped cucumber into a bowl.
+* Crush and mince the garlic.
+* Add the vinegar, soy sauce, salt, oyster sauce, and minced garlic to the bowl in sequence. Stir well and marinate for 15 minutes.
+* Pour in the sesame oil and stir evenly.
+
+## Additional Notes
+
+* In some cases, the ends of the cucumber may taste bitter. Wash and cut them off, then verify if they are bitter.
+* You can eat it immediately after preparation, or refrigerate it (not freeze) after preparing it in advance.
+* If refrigerated, wrap it tightly with plastic wrap and consume within 8 hours. Otherwise, the cucumber may lose its crisp texture due to over-marination.
+* Peeling the cucumber is recommended for a better texture.
+
+If you encounter any issues or have suggestions for improvement while following this guide, please submit an Issue or Pull request.