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/清蒸南瓜.md

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+# How to Make Steamed Pumpkin
+
+Steamed pumpkin is a simple home-cooked dessert or staple dish. It preserves the natural sweetness and nutrients of the pumpkin to the greatest extent, resulting in a soft and glutinous texture. It is a great choice for a healthy diet. Beginners can typically complete it in 15-20 minutes (mostly steaming time).
+
+Estimated Cooking Difficulty: ★
+
+## Essential Ingredients and Tools
+
+- Pumpkin
+- Steamer
+
+## Preparation
+
+Before each preparation, determine how many servings you want to make. One serving is enough for 1-2 people.
+
+Per serving:
+
+- Pumpkin: 300 g
+- Drinking water: 1000 ml (for the steamer)
+
+## Instructions
+
+- Wash the outer skin of the pumpkin, remove the pulp and seeds.
+- Cut the pumpkin into slices approximately 2 cm thick and set aside.
+- Add 1000 ml of drinking water to the pot of the steamer.
+- Arrange the sliced pumpkin evenly on a plate.
+- Once the water in the steamer is boiling, place the plate with the pumpkin into the steamer.
+- Cover the lid and steam on high heat for **15-20 minutes**, until the pumpkin is soft and can be easily pierced with chopsticks.
+- Turn off the heat and carefully remove the plate.
+
+## Additional Notes
+
+- The sweetness and texture of the pumpkin may vary depending on the variety. Older pumpkins are usually sweeter and have a flourier texture.
+- Pumpkin skin contains nutrients. If you prefer, you can steam it without peeling, but ensure it is thoroughly washed.
+- The steaming time depends on the size and thickness of the pumpkin pieces, as well as the variety. Using chopsticks to test is a good way to determine if it is fully cooked.
+
+If you encounter any issues or have suggestions for improvement while following this guide, please submit an Issue or Pull request.