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/话梅煮毛豆/话梅煮毛豆.md

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+# How to Make Preserved Plum Boiled Edamame
+
+A simple, delicious dish that is both sweet and sour, with high nutritional value
+
+Estimated cooking difficulty: ★★
+
+## Essential Ingredients and Tools
+
+* Edamame
+* Preserved plums
+* Table salt
+
+## Ingredients per serving:
+
+* Edamame: 300 g
+* Preserved plums: 6 pieces
+* Table salt: 2 g
+
+## Instructions
+
+* Add table salt to water and soak the edamame for 15 minutes
+* Add boiling water, then pour in the edamame and preserved plums; boil for 20-30 minutes
+* Remove from heat and serve
+
+![Example dish](./1.jpeg)
+
+## Additional Notes
+
+If you follow this guide and encounter any issues or have suggestions for improvement, please submit an Issue or Pull request.