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/脆皮豆腐.md

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+# How to Make Crispy Tofu
+
+Rich sauce coats the tofu, making it impossible to stop eating once you take a bite. It's incredibly delicious.
+
+Estimated Cooking Difficulty: ★★★
+
+## Essential Ingredients and Tools
+
+- Firm tofu
+- Eggs
+- Light soy sauce
+- Dark soy sauce
+- Oyster sauce
+- White sugar
+- Cornstarch
+- Skillet
+
+## Quantities
+
+Per serving:
+
+- Firm tofu 1 block (purchase 1.25 blocks per person at the market)
+- Eggs 2 per block of tofu
+- Cornstarch 50 g per block of tofu
+- Light soy sauce 20 g
+- Oyster sauce 10 g
+- Dark soy sauce 5 g
+- White sugar 10 g
+
+## Instructions
+
+- Beat the eggs to create egg wash and set aside
+- Prepare the sauce (20 g light soy sauce + 10 g oyster sauce + 5 g dark soy sauce + 10 g white sugar + 10 g cornstarch + 200 ml water)
+- Slice the firm tofu (personal recommendation, for reference only: 5 slices per person, 1.2 cm thick)
+- Pour cornstarch onto a plate, coat the tofu slices with starch, then dip them in the egg wash, and set aside
+- Heat the skillet and add 18 ml of cooking oil. Wait 10 seconds for the oil temperature to rise
+- Place the egg-coated tofu slices evenly in the pan, covering the bottom. Pan-fry over low heat until golden, then flip
+- Once both sides are golden, pour in the sauce, ensuring each piece of tofu is coated. Cook on high heat for 3 minutes until the sauce thickens
+- Turn off the heat
+
+## Additional Content
+
+If you encounter any issues or have suggestions for improvement while following this guide, please submit an Issue or Pull request.