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/金汤力/金汤力.md

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+# How to Make a Gin & Tonic
+
+**Alcohol is harmful to health. Minors are prohibited from drinking.**
+
+Estimated Cooking Difficulty: ★★
+
+## Essential Ingredients and Tools
+
+Ingredients
+
+- Gin
+- Tonic water
+- Lemon
+- Ice cubes
+- Fresh green leaves (optional, for garnish)
+
+Tools
+
+- Manual juicer
+
+## Measurements
+
+One serving, approximately 350 ml (including ice)
+
+- Gin: 30–40 ml
+- Tonic water: 1 can
+- Lemon: 1
+- Ice cubes: 100 g
+
+## Instructions
+
+Preparing the Lemon
+
+1. Cut the lemon in half (**knife perpendicular to the axis of the lemon**), and slice one piece from one half for later use.
+2. Cut the remaining half into quarters. Use the juicer to extract juice from the four wedges and set it aside in a container.
+
+Mixing the Drink
+
+1. Choose a glass; a transparent glass with a capacity of 350–400 ml is recommended.
+2. Place 100 g of ice cubes at the bottom of the glass.
+3. Pour in 30–40 ml of gin.
+4. Add 15 ml of lemon juice (add more or all of it if you prefer a sourer taste).
+5. Stir gently with a spoon.
+6. Place the reserved lemon slice into the glass.
+7. Slowly pour the tonic water along the side of the glass until full (avoid pouring directly onto the ice to prevent excessive foaming and loss of carbonation).
+8. Gently lift and lower the spoon to mix the liquid (do not stir in a circular motion to avoid excessive foaming and loss of carbonation).
+9. Garnish with fresh green leaves on the surface (optional).
+
+## Additional Content
+
+### Finished Product
+
+![gin-tonic](./gin-tonic.jpg)
+
+If you encounter any issues or have suggestions for improvement while following this guide, please submit an Issue or Pull request.