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/meat_dish/香干芹菜炒肉/香干芹菜炒肉.md

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+# Stir-fried Pork with Celery and Smoked Tofu
+
+![Stir-fried Pork with Celery and Smoked Tofu](./香干芹菜炒肉.jpg)
+
+Stir-fried Pork with Celery and Smoked Tofu is a very simple home-style dish. It is said that eating more celery can help alleviate high blood pressure. When stir-fried with smoked tofu and pork, it becomes quite delicious. Beginners can complete this dish in about 30 minutes (including prep time).
+
+Estimated Cooking Difficulty: ★★★
+
+## Ingredients and Tools
+
+- Smoked tofu (xianggan)
+- Celery
+- Pork
+- Garlic
+- Chili peppers: Green or red chilies work
+- Sichuan peppercorns: Optional
+- Salt
+- Chicken bouillon powder: Optional
+- Dark soy sauce
+- Oyster sauce
+- Cooking oil
+
+## Quantities
+
+Note: These quantities are for approximately 2 servings.
+
+Per serving:
+
+- Smoked tofu: 150g
+- Celery: 4 stalks
+- Pork: 200g
+- Garlic: 2 cloves
+- Chili peppers: 4 pieces
+- Sichuan peppercorns: 6 grains (omit if you don't like them, or use Sichuan peppercorn water)
+- Salt: 5g
+- Chicken bouillon powder: 3g
+- Dark soy sauce: 8ml
+- Oyster sauce: 5ml
+- Cooking oil: 10-15ml
+
+## Instructions
+
+- Remove the leaves from the celery, cut into segments, and slice into strips no longer than 4cm. Set aside.
+- Slice the smoked tofu into strips about the width of your pinky finger. Set aside.
+- Slice the garlic or mince it into garlic paste. Set aside.
+- Slice the chili peppers into rings or diagonal strips. Set aside.
+- Heat the wok and add 10-15ml of cooking oil. Wait 10 seconds for the oil temperature to rise.
+- Add the Sichuan peppercorns and garlic to stir-fry until fragrant (if you eat ginger, you can add some ginger slices/shreds).
+- Add the pork and stir-fry until the color changes. Add 8ml of dark soy sauce to color and stir-fry evenly (if you have doubanjiang, you can add 3ml and stir-fry together).
+- Add the smoked tofu and stir-fry evenly (about 2 minutes).
+- Add the chili peppers and stir-fry evenly (about 1-2 minutes).
+- Add the celery and 5g of salt, and stir-fry for 1 minute.
+- Add 3g of chicken bouillon powder and 5ml of oyster sauce, stir-fry evenly, and serve.
+
+## Additional Notes
+
+- If you cannot find celery or the celery is too thick, consider blanching it: put it in boiling water for 1 minute, then remove and rinse with cold water (to keep it crisp).
+- If the smoked tofu you bought is hard or dense, you can blanch it after slicing.
+- [Stir-fried Pork with Celery and Smoked Tofu Tutorial](https://www.xiachufang.com/recipe/105987156/)
+
+If you find any issues or have improvements for the process described in this guide, please submit an Issue or Pull request.