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/drink/冬瓜茶.md

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+# How to Make Winter Melon Tea
+
+Winter melon tea is a refreshing traditional beverage. Beginners typically need 4 to 5 hours to complete it.
+
+Estimated Cooking Difficulty: ★★
+
+## Essential Ingredients and Tools
+
+- Winter melon
+- Rock sugar
+- Plastic wrap
+- Strainer
+- Large pot
+
+## Calculations
+
+Before each preparation, determine how many servings you want to make. One serving is exactly enough for 4–5 people.
+
+Per serving:
+
+- Winter melon: 1000g
+- Rock sugar: 300g
+
+## Instructions
+
+1. **Prepare the winter melon**: Peel the winter melon, remove the seeds, and cut it into small pieces (no larger than 4cm per piece).
+2. **Add rock sugar**: Mix the winter melon with the rock sugar until well combined. Cover with plastic wrap and refrigerate for at least 2 hours.
+3. **Cook the winter melon**: The winter melon will have released a lot of water. Pour it into a pot, bring to a boil over high heat, then reduce to medium-low heat and simmer slowly for 1–2 hours. Stir frequently to prevent sticking.
+4. **Strain the winter melon tea**: Use a strainer to filter the cooked winter melon tea liquid, removing the melon pieces and keeping only the liquid.
+5. **Cool down**: Let the winter melon tea liquid cool, then pour it into a clean container and refrigerate.
+6. **Serve**: The prepared winter melon tea liquid is a concentrate. Add water or other beverages according to your preference. It can be enjoyed hot or cold.
+
+## Additional Notes
+
+- **Taste adjustment**: The amount of rock sugar can be adjusted to achieve your preferred level of sweetness.
+- **Storage method**: Store in the refrigerator. It is recommended to consume within 1 week.
+
+If you encounter any issues or have suggestions for improvement while following this guide, please submit an Issue or Pull request.