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/condiment/葱油.md

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+# How to Make Scallion Oil
+
+Scallion oil is produced by extracting various aromatic spices, primarily scallions, using hot oil. It can be used to season meat fillings, make cold dishes, or as a finishing oil for stir-fried dishes.
+
+Estimated Cooking Difficulty: ★★★
+
+## Essential Ingredients and Tools
+
+- Oil
+- Scallions (both green onions and scallions are fine)
+- Ginger
+- Onion
+- Cooking wine
+- Cilantro (optional)
+- Dried shrimp (optional)
+
+## Quantities
+
+- Oil: 200g
+- Scallions: 80g
+- Ginger: 20g
+- Cooking wine: 10ml
+- Onion: 150g
+- Dried shrimp: 50g
+
+## Instructions
+
+- Soak the dried shrimp in 50°C warm water, add 10ml of cooking wine to remove the fishy smell, soak for 10 minutes, then remove and drain.
+- Wash the scallions and cilantro, cut them into 5cm segments, and pat dry to remove surface moisture.
+- Slice the onion, boil it in hot water in a pot for 5 minutes, then remove and drain.
+- Peel the ginger and slice it.
+- Pour all the oil into a pot, add the pre-treated ingredients, and fry over medium-low heat for 20 minutes.
+
+## Additional Notes
+
+- The fried dried shrimp and scallion residue can also be eaten. You can strain the scallion oil to remove the residue or keep it.
+- Dried shrimp greatly enhances the savory and aromatic flavor of the scallion oil, adding a sweet and umami taste.
+
+If you find any issues or have suggestions for improvement while following this guide, please submit an Issue or Pull request.