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/酸梅汤（半成品加工）.md

@@ -0,0 +1,36 @@
+# How to Make Sour Plum Soup (Semi-finished Product)
+
+Estimated Cooking Difficulty: ★
+
+## Essential Ingredients and Tools
+
+- Sour plum crystal solid beverage
+- Rock sugar (optional)
+- Beijing Erguotou liquor (optional)
+
+## Calculations
+
+- Drinking water: 1177 g
+- Sour plum crystal solid beverage: 120 g
+- Rock sugar: 9 g
+- Beijing Erguotou liquor: 48 g
+
+All the above quantities can be increased or decreased proportionally.
+
+## Instructions
+
+- Measure 1177 g of drinking water.
+- Add 60 g of sour plum crystal solid beverage and stir clockwise with a tablespoon for 50 turns.
+- Add the remaining 60 g of sour plum crystal solid beverage and stir clockwise with a tablespoon for another 50 turns.
+- Add 9 g of rock sugar and stir clockwise with a tablespoon for 100 turns.
+- Add 48 g of Beijing Erguotou liquor and stir clockwise with a tablespoon for 30 turns.
+
+## Additional Notes
+
+If you do not have rock sugar or Beijing Erguotou on hand, you can skip step 4 or step 5 in the instructions.
+
+Chilling in the refrigerator before drinking yields better results.
+
+**Do not drive after drinking.**
+
+If you encounter any issues or have suggestions for improvement while following this guide, please submit an Issue or Pull request.