Unifies and refactors storage selection logic to always prompt the user for container and template storage choices unless only one option exists, as per requirement #4. Removes legacy selection functions, updates all relevant install and menu flows to use the new logic, and ensures storage settings are consistently written to vars files and environment variables. Also improves code clarity and maintains storage summary output.
Refactored case statements and conditional checks to use more idiomatic and consistent Bash syntax. Replaced German comments with English, improved readability by splitting long lines, and standardized variable assignments. Enhanced maintainability by using case/esac and if/then constructs, and replaced double-bracketed conditionals with POSIX-compliant single brackets where appropriate.
Added new preset and menu options for App Defaults, Diagnostics, and Storage Settings. Refactored the menu to be dynamically built and improved handling for each choice, including better diagnostics toggling and support for app-specific defaults. This enhances flexibility and user experience in the installation script.
Reworks the app defaults save/update logic in misc/build.func to support updating existing defaults with a diff and interactive menu, and adds robust var_* parsing and whitelisting. Removes legacy error and curl handler functions from misc/core.func, streamlining error handling and reducing code duplication.
