Add multilingual support with translations for German, Russian, French, and Chinese

Added time limits and backup functions for servers

migrations/README.md

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+# Database Migrations
+
+This directory contains SQL migration files that are automatically executed when the database container is first initialized.
+
+## Execution Order
+
+Migration files are executed in **alphabetical order** by MySQL's Docker entrypoint. Files are numbered to ensure correct execution sequence:
+
+1. `001_init.sql` - Main database schema and tables
+2. `002_translations_ru.sql` - Russian translations
+3. `003_translations_es.sql` - Spanish translations
+4. `004_translations_de.sql` - German translations
+5. `005_translations_fr.sql` - French translations
+6. `006_translations_zh.sql` - Chinese translations
+
+## Adding New Migrations
+
+When creating new migration files:
+
+1. Use numerical prefix (e.g., `007_add_feature.sql`)
+2. Ensure the number is higher than existing migrations
+3. Use descriptive names
+4. Always use `ON DUPLICATE KEY UPDATE` for INSERT statements to make migrations idempotent
+
+## Manual Execution
+
+To manually run migrations in an existing database:
+
+```bash
+# Single migration
+docker compose exec db mysql -uroot -prootpassword amnezia_panel < migrations/001_init.sql
+
+# All migrations in order
+for file in migrations/*.sql; do
+  echo "Executing $file..."
+  docker compose exec -T db mysql -uroot -prootpassword amnezia_panel < "$file"
+done
+```
+
+## Regenerating Translation Migrations
+
+To regenerate translation migrations from the current database:
+
+```bash
+# Export translations for a specific language
+docker compose exec -T db mysql -uroot -prootpassword amnezia_panel \
+  --default-character-set=utf8mb4 \
+  -e "SELECT CONCAT('(''', language_code, ''', ''', translation_key, ''', ''', 
+      REPLACE(translation_value, '''', ''''''), '''),') 
+      FROM translations WHERE language_code = 'ru' ORDER BY translation_key;" \
+  | grep -v "CONCAT" > /tmp/translations_ru.sql
+
+# Then wrap with INSERT statement and ON DUPLICATE KEY UPDATE
+```