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/condiment/蔗糖糖浆/蔗糖糖浆.md

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+# How to Make Simple Syrup
+
+Dissolving sugar in advance makes it easier to sweeten beverages (especially cold drinks) during preparation.
+
+Estimated cooking difficulty: ★
+
+## Ingredients and Tools
+
+Ingredients
+
+- Granulated sugar
+- Water
+
+Tools
+
+- Sealable container (high-borosilicate glass bottles are recommended and inexpensive)
+
+![bottle](./bottle.jpg)
+
+## Ratios
+
+Recommended ratio: Sugar : Water = 1 : 1. This makes it easy to control sugar amounts; for example, to get 15 grams of sugar, measure out 30 grams of syrup.
+
+- 100 grams of water
+- 100 grams of granulated sugar
+
+## Instructions
+
+1. Mix the weighed granulated sugar with the water in the container until dissolved.
+2. Seal the container and refrigerate.
+
+## Additional Notes
+
+The water can be hot or cold. If you need the syrup quickly, you can dissolve the sugar in hot water and then let the syrup cool.
+
+The prepared syrup does not spoil easily and can typically be stored in the refrigerator for a week.
+
+If you encounter any issues or have suggestions for improvement while following this guide, please submit an Issue or Pull request.