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/可乐桶.md

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+# How to Make a Boilermaker
+
+**Alcohol consumption is harmful to health. Minors are prohibited from drinking.**
+
+Estimated Cooking Difficulty: ★★
+
+## Essential Ingredients and Tools
+
+Ingredients
+
+- Bourbon whiskey
+- Coca-Cola
+- Ice cubes
+- Lemon (optional, for enhanced flavor)
+
+Tools
+
+- Manual citrus juicer
+
+## Measurements
+
+One serving, approximately 900 ml (including ice)
+
+- Whiskey: 100 ml
+- Coca-Cola: 500 ml
+- Lemon: 1 piece
+- Ice cubes: 300 g
+
+## Instructions
+
+Preparing the Lemon
+
+1. Cut the lemon in half (**with the knife perpendicular to the line connecting the stem and blossom ends of the lemon**), and slice one piece from one half for garnish.
+2. Cut the remaining lemon halves in half again. Use the citrus juicer to extract juice from the four resulting quarters into a container for later use.
+3. Place the squeezed lemon halves into a container for later use.
+
+Final Assembly
+
+1. Choose a glass; a large glass or metal bucket with a capacity of about 1 liter is recommended.
+2. Add the ice cubes and squeezed lemon halves to the glass (arrange the lemon and ice according to personal preference).
+3. Pour in 15 ml of lemon juice (add more or all of it if you prefer a sour taste).
+4. Slowly pour Coca-Cola along the side of the glass until it reaches 3/4 of the way to the rim (maintain a ratio of approximately 5:1 for Coca-Cola to whiskey).
+5. Pour in the whiskey until the glass is full.
+
+## Additional Notes
+
+The flavor of the whiskey in a Boilermaker is masked by the ice and Coca-Cola, making it easy for those with low alcohol tolerance to overconsume unknowingly. Please ensure the safety of yourself and others when preparing this drink.
+
+If you encounter any issues or have suggestions for improvement while following this guide, please submit an Issue or Pull request.