Add Restocking view, Orders enhancements, i18n updates, and docs

[uudayasree]

Summary

• Add new Restocking view with budget slider and recommended restock table
• Add useRestocking composable for restocking logic and budget management
• Enhance Orders view with additional columns and status filtering improvements
• Extend en/ja locale files with new i18n keys for Restocking and Orders
• Update App.vue and main.js to register the new Restocking route
• Update CLAUDE.md files with revised guidance and conventions
• Add docs/architecture.html and fix scripts/hooks file modes

Test plan

• Navigate to Restocking page and verify budget slider updates recommended items
• Verify Orders page shows new columns and filters correctly
• Switch language to Japanese and verify new i18n strings render
• Run backend tests: cd tests && uv run pytest backend/ -v
• Confirm all 7 nav tabs load without errors in browser

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