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/soup/奶油蘑菇汤.md

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+# How to Make Cream of Mushroom Soup
+
+Estimated Cooking Difficulty: ★
+
+---
+
+## Ingredients and Tools Required
+
+- White mushrooms  
+- Onion  
+- Butter  
+- Flour  
+- Milk  
+- Heavy cream  
+- Coarsely ground black pepper  
+- Salt  
+- Water
+
+---
+
+## Quantities
+
+Before starting, determine how many servings you wish to prepare. One serving is sufficient for 1–2 people.
+
+Total amounts (per serving):
+
+- White mushrooms: 200 g  
+- Onion: 50 g  
+- Butter: 15 g  
+- Flour: 10 g  
+- Milk: 200 ml  
+- Heavy cream: 30 ml  
+- Water: 100 ml  
+- Salt: 2 g  
+- Coarsely ground black pepper: 1 g
+
+---
+
+## Instructions
+
+1. Slice the white mushrooms and mince the onion; set aside.  
+2. Melt the butter in a skillet over low heat, then add the onion and sauté until translucent.  
+3. Add the mushrooms and cook until they release their moisture and become soft. Sprinkle in the flour and stir well to combine.  
+4. Pour in the milk and water, stir continuously, and bring to a simmer over low heat. Keep stirring to prevent the mixture from sticking to the bottom.  
+5. Reduce heat and simmer for about 10 minutes, or until the soup thickens.  
+6. Stir in the heavy cream and heat for an additional minute. Season with salt and black pepper to taste.  
+7. Optional: After removing from heat, use an immersion blender to puree the soup until smooth.
+
+---
+
+## Additional Tips
+
+- Reserve some mushroom slices for garnish; sauté them separately until fragrant before adding to the finished soup.  
+- Using chicken broth instead of water enhances the flavor. Keep the total liquid volume under 300 ml per serving.  
+- For a thicker consistency, increase the amounts of flour and heavy cream.  
+- Best served immediately. Refrigeration or freezing is not recommended.
+
+---
+
+If you encounter any issues or have suggestions for improvement while following this guide, please submit an Issue or Pull Request.