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/酸辣蕨根粉.md

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+# How to Make Spicy and Sour Fern Root Noodles
+
+Spicy and sour fern root noodles are a simple cold dish suitable for beginners. They can be served as a main course and have a predominantly spicy and sour flavor. The estimated preparation time is 10 minutes.
+
+Estimated Cooking Difficulty: ★★
+
+## Essential Ingredients and Tools
+
+* Fern root noodles
+* Chili oil (you po la zi)
+* Soy sauce
+* Rice vinegar
+* Millet peppers (optional)
+* Garlic (optional)
+* Green onions (optional)
+* Salt
+* Sugar
+* A pot with some depth
+
+## Calculations
+
+Per serving:
+
+* Soy sauce : Vinegar : Chili oil = 3 : 2 : 2 (The exact amount of sauce depends on the quantity of fern root noodles; this ratio is intended to ensure the flavor profile remains correct.)
+* If the sauce tastes too mild, add 2 to 5 grams of salt.
+* If you want the sauce to be more savory, add 2 grams of sugar.
+
+## Instructions
+
+### Boiling the Fern Root Noodles
+
+* Fill a pot with water to about 3/5 of its depth and bring it to a boil.
+* Once the water is boiling, add the fern root noodles and simmer over medium-low heat for 8 minutes.
+* Remove from heat.
+
+### Preparing the Sauce
+
+* Add soy sauce, vinegar, and chili oil according to the specified ratio.
+* Dip a chopstick into the sauce and taste it.
+* If the soy sauce flavor is too strong, add the prepared salt.
+* If it lacks savoriness, add the prepared sugar.
+* Stir thoroughly until most of the granular seasonings have dissolved.
+
+### Plating and Finishing
+
+* Take a bowl.
+* Add the sauce prepared in the previous step.
+* Rinse the boiled fern root noodles with cold water and place them into the sauce.
+* Stir thoroughly.
+* Finely chop the prepared green onions, garlic, and millet peppers, then sprinkle them over the noodles.
+* Done! (｡･∀･)ﾉﾞ
+
+## Additional Notes
+
+* Green onions, ginger, and garlic are optional seasonings. Adding them enhances the flavor, but omitting them is fine.
+* The amount of sugar and salt depends on personal taste. Please adjust accordingly.
+* It is recommended to use a bowl for serving, as using a plate may make eating the noodles more difficult.
+* The overall flavor is spicy. If you cannot handle spicy food, reduce the amount of chili oil and omit the millet peppers.
+
+If you encounter any issues or have suggestions for improving the process while following this guide, please submit an Issue or Pull request.