Refactor iForum bootstrap to stop direct central Art includes

[Copilot]

The module still relied on central bootstrap/runtime files to pull in src/class/art/* directly, coupling entry-point initialization to the Art runtime. This change moves those bootstrap responsibilities behind the module bootstrap/helper layer while preserving existing page and object-loading behavior.

• Bootstrap routing

  • Central bootstrap points no longer include src/class/art/* directly:
    • src/icms_version.php
    • src/header.php
    • src/include/functions.ini.php
    • src/admin/admin_header.php
  • These files now initialize through src/include/bootstrap.php, keeping Art loading behind a module-owned bootstrap surface.

• Shared Art runtime helpers

  • Added bootstrap-level helpers to resolve module paths and load Art runtime pieces on demand:
    • iforum_load_art_functions_ini()
    • iforum_load_art_functions()
    • iforum_load_art_object()
  • This centralizes runtime wiring and avoids repeating Art include logic across entry points.

• Compatibility and deprecation

  • iforum_load_object() remains in place as a compatibility wrapper.
  • It is now explicitly deprecated and delegates to iforum_load_art_object() instead of calling Art bootstrap directly.

• Entry-point behavior

  • Front-end bootstrap continues to initialize shared functions through the module helper path.
  • Admin bootstrap still loads the Art admin runtime, but through the module bootstrap/helper layer rather than direct includes.

// Before
include_once ICMS_ROOT_PATH."/modules/".$modulename."/class/art/functions.ini.php";

// After
include_once ICMS_ROOT_PATH."/modules/".$modulename."/include/bootstrap.php";