Refactor demo apps: improve naming conventions and code structure

[oblomov-dev]

Summary

This PR refactors multiple demo application classes to improve code quality, readability, and consistency. The changes focus on standardizing naming conventions, simplifying string concatenation syntax, and improving code organization.

Key Changes

Naming Convention Updates:

• Removed mv_ prefix from instance variable names across demo apps 359, 360 (e.g., mv_price → price, mv_first_name → first_name)
• Removed lv_ prefix from local variable names (e.g., lv_float_bind → float_bind, lv_concat → concat)
• Removed iv_ prefix from method parameters in demo app 357 (e.g., io_row → row, iv_icon → icon)
• Renamed type definition in demo app 358 from ty_product to ty_s_product for consistency
• Renamed table variable in demo app 358 from mt_products to t_products

Code Structure Improvements:

• Removed CREATE PUBLIC clause from class definitions (changed to DEFINITION PUBLIC only)
• Added blank lines between method definitions for better readability
• Extracted initialization logic in demo app 355 into separate on_init() and view_display() methods
• Moved client reference assignment to the beginning of main() method in demo app 355

String Concatenation Modernization:

• Converted multi-line string concatenations to inline template literals using |...| syntax in demo apps 359 and 360
• Improved readability of complex binding expressions by using template string interpolation

Code Organization:

• Added blank lines after class definition sections for visual separation
• Consistent method ordering and spacing throughout all modified classes

Notable Implementation Details

• All functional behavior is preserved; these are purely refactoring changes
• The changes improve code maintainability by following more modern ABAP naming conventions
• Template literal syntax makes binding expressions more readable and easier to maintain

https://claude.ai/code/session_01GwFbxdvWVuf3iKjN5VhHrb