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/vegetable_dish/水油焖蔬菜.md

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+# How to Make Water-Oil Braised Vegetables
+
+Adding oil to water-oil braised vegetables enhances the texture and improves the intake of fat-soluble vitamins. This method offers more benefits compared to eating vegetables raw.
+
+Estimated Cooking Difficulty: ★★
+
+## Essential Ingredients and Tools
+
+* Cooking oil
+* Salt
+* Oyster sauce (optional)
+* Leafy green vegetables
+
+## Calculations
+
+Leafy greens have high water content, so they may appear voluminous during preparation. However, their volume decreases rapidly when heated.
+
+* Leafy green vegetables: 300g ~ 500g
+
+## Instructions
+
+* Wash the vegetables thoroughly.
+* Add 150ml of water to the pot and bring it to a boil. (The water does not need to completely submerge the vegetables.)
+* Add 3g of salt.
+* (Optional) Add 3ml of oyster sauce.
+* Add 2ml of cooking oil.
+* Add the vegetables, stir briefly, then cover the pot and braise for 1 minute.
+* Serve on a plate.
+
+## Additional Tips
+
+* If unsure about the saltiness, start with less salt, taste before serving, and adjust as needed.
+* You can substitute water with chicken broth or bone broth for a richer flavor.
+* Avoid braising for too long.
+
+If you encounter any issues or have suggestions for improvement while following this guide, please submit an Issue or Pull request.