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/陕北熬豆角.md

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+# Recipe for Shaanxi-Style Braised Green Beans
+
+Shaanxi-style braised green beans is a dish that is extremely beginner-friendly. Because it uses the "braising" method, the ingredients can vary in quantity or even be omitted, making it almost impossible to fail.
+
+Estimated Cooking Difficulty: ★★
+
+## Essential Ingredients and Tools
+
+- Green beans
+- Potatoes
+- Tomatoes
+- Spiral chili peppers (optional)
+- Salt
+- Light soy sauce
+- Five-spice powder
+- Oyster sauce
+- Green onion
+- Ginger
+- Garlic
+
+## Measurements
+
+Note: Due to variations in individual ingredients, this recipe is for 2 servings.
+
+- Green beans: 300g for 2 servings
+- Potatoes: 1 piece for 2 servings
+- Tomatoes: 1 piece for 2 servings
+- Spiral chili peppers (optional): 2 pieces for 2 servings
+- Salt: 6g for 2 servings
+- Light soy sauce: 6ml for 2 servings
+- Five-spice powder: 3g for 2 servings
+- Oyster sauce: 6ml for 2 servings
+- Green onion: 3 rings
+- Ginger: 2g
+- Garlic: 2 cloves
+- Chopped cilantro (optional): to taste
+
+## Instructions
+
+- Slice the green onion into rings, mince the garlic, and julienne the ginger. Set aside.
+- Remove the strings from the green beans, cut them into 2-10cm segments, and set aside.
+- Peel the potatoes, cut them into 1cm³ cubes, and set aside.
+- Peel the tomatoes, cut them into 1cm³ cubes, and set aside.
+- Remove the seeds from the chili peppers, slice them into 0.15cm wide strips, and set aside.
+- Heat oil (10ml - 15ml) in a pot. Once the oil starts to smoke, add the green onion, ginger, and garlic. Stir-fry until fragrant.
+- Add the green beans and stir-fry until they change color (from dark green to bright green).
+- Add the potato cubes and stir-fry for 30 seconds.
+- Add hot water (just enough to cover the vegetables). Cover the pot and braise until the potatoes become soft (you can check with chopsticks).
+- Add the tomato cubes, salt, light soy sauce, oyster sauce, five-spice powder, and chili peppers. Continue braising until the tomatoes break down into a sauce (stir occasionally to prevent sticking to the bottom).
+- Add the chopped cilantro and serve.
+
+## Additional Notes
+
+- After adding the tomatoes and continuing to braise, stir occasionally to prevent the bottom from burning.
+
+If you encounter any issues or have suggestions for improvement while following this guide, please submit an Issue or Pull request.