feat: Add comprehensive backend validation, toast notifications, and Tokyo Night theme

- Backend: Add server-side validation with go-playground/validator/v10
- Frontend: Add toast notifications for API errors with @zerodevx/svelte-toast
- UI: Complete Tokyo Night theme redesign with modern animations
- Docs: Update COMPLETE_DOCUMENTATION.md and README.md with all enhancements
- Validation: Email format, password strength, and input sanitization
- UX: Real-time error feedback, loading states, and responsive design

backend/static/_app/immutable/chunks/6OCXa8_L.js

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backend/static/_app/immutable/chunks/BOU_Z_Ye.js

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backend/static/_app/immutable/chunks/C9HAc536.js

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backend/static/_app/immutable/chunks/DUCk1qN8.js

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backend/static/_app/immutable/chunks/VM9GfMNA.js

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backend/static/_app/immutable/chunks/kSfNJqxT.js

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