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/虎皮青椒/虎皮青椒.md

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+
+# Recipe for Tiger Skin Green Peppers
+
+Estimated Cooking Difficulty: ★★★
+
+## Essential Ingredients and Tools
+
+- Green peppers
+- Garlic
+- White sugar (the soul of the dish)
+- Vinegar
+- Light soy sauce
+- Salt
+- Bowl or a container with sufficient depth
+
+## Quantities
+
+Per serving:
+
+- 5 green peppers (those measuring 10-15cm in length are ideal)
+- 2-3 cloves of garlic
+- 20ml oil
+- 15g white sugar
+- 15ml light soy sauce
+- 15ml fragrant vinegar
+- 4g salt
+
+## Instructions
+
+- Remove the stems from the green peppers and rinse them thoroughly under running tap water.
+- Slice the green peppers lengthwise into long strips, cutting each pepper into 3-4 pieces.
+- Peel the garlic and mince it into fine pieces, approximately 2mm x 2mm x 2mm in size.
+- `Seasoning 1`: Pour 20ml of oil into a small bowl and add the minced garlic.
+- `Seasoning 2`: Combine the white sugar, light soy sauce, vinegar, and salt in a bowl or other container, and stir well.
+- Pour `Seasoning 1` into a wok or pan and heat over medium heat. Once the oil is hot, add the green pepper strips, ensuring they are laid out flat without overlapping.
+- Use a spatula to press down on the peppers continuously, flipping them when appropriate.
+- Stir-fry for about 2 minutes until the surface of the peppers becomes wrinkled, then pour in `Seasoning 2`.
+- Increase the heat and continue stir-frying for 30 seconds before removing from heat and serving on a plate.
+
+## Additional Notes
+
+If you encounter any issues or have suggestions for improvement while following this guide, please submit an Issue or Pull request.
+
+![Tiger Skin Green Peppers](./虎皮青椒.jpg)