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/staple/火腿饭团/火腿饭团.md

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+# How to Make Ham Rice Balls
+
+![Ham Rice Ball](./rice-ball.png)
+Delicious! Rich in carbohydrates, protein, and vitamins. Easy to make with basic skills, estimated preparation time: 1 hour.
+
+Estimated Cooking Difficulty: ★★★★
+
+## Essential Ingredients and Tools
+
+- Ham
+- Rice
+- Water
+- Frozen peas (optional)
+- Frozen corn kernels (optional)
+- Crushed nori (optional)
+- Your favorite salad dressing (Japanese mayo recommended!)
+
+## Calculation
+
+Determine how many servings you want to make before each preparation. One serving is sufficient for 2 people.
+
+Per serving:
+
+- Ham (100g)
+- Rice (125g)
+- Water (90ml)
+- Frozen peas (30g)
+- Frozen corn kernels (30g)
+- Crushed nori (10g)
+- Your favorite salad dressing (20g)
+- Cooking oil (10-15ml)
+
+## Instructions
+
+- Place the rice and water in the rice cooker, select the rice cooking mode, and wait for it to finish.
+- Put the frozen corn kernels and peas in a pot, add enough water to cover all ingredients, bring to a boil, let stand for 2 minutes, then remove.
+- Cut the ham into 1cm cubes.
+- Meanwhile, add 10ml of cooking oil to a pan and stir-fry the ham until it is browned.
+- Place the rice, ham, crushed nori, peas, corn kernels, and salad dressing in a bowl, and mix well.
+- Plate the dish (if desired).
+
+## Additional Notes
+
+- Adjust the amount of salad dressing according to your personal taste.
+- You can try mixing different types of salad dressing.
+- Reference: Xiaohongshu - "The Rice Lover is Getting Sleepy"
+
+If you encounter any issues or have suggestions for improvement while following this guide, please submit an Issue or Pull Request.