Refactored load.php into different use case startup parts

[s3inlc]

Currently, load.php is called on every page call. In there, migrations is executed every time causing additional database connections and unnecessary load.

This PR splits the load.php into three parts:

• setup.php (only called once on start of the docker container) checking the migrations and initial setup (if needed)
• include.php doing the part of including all needed files
• load.php doing the UI startup initialization needed for the current UI, but is not required for the new API (and later can then be removed when the UI gets removed)

[Copilot]

Pull request overview

This PR refactors the monolithic load.php file into three separate files with distinct responsibilities to improve performance by avoiding unnecessary database migrations on every page request. The new structure includes:

• setup.php (one-time initialization with migrations)
• include.php (file includes only)
• load.php (UI-specific initialization)

Changes:

• Split initialization logic into three specialized files in src/inc/startup/ directory
• Updated all UI page files to use startup/load.php
• Updated all API endpoint files to use startup/include.php (avoiding UI overhead)
• Updated docker entrypoint to call startup/setup.php for one-time initialization

Reviewed changes

Copilot reviewed 57 out of 57 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/inc/startup/setup.php	Handles database migrations and initial setup (one-time execution)
src/inc/startup/include.php	Contains all file includes without UI or migration logic
src/inc/startup/load.php	Handles UI initialization, calls include.php internally
src/*.php (UI files)	Updated to require startup/load.php for full UI initialization
src/api/*.php	Updated to require startup/include.php for lightweight API execution
src/inc/apiv2/**/*.php	Updated to require startup/include.php for API v2 endpoints
src/install/**/*.php	Updated update scripts to use startup/load.php
docker-entrypoint.sh	Updated to call startup/setup.php for container initialization
ci/server/setup.php	Updated paths but contains critical bug (wrong directory name)
src/inc/apiv2/common/AbstractModelAPI.class.php	Added else clause to fix potential undefined variable (unrelated fix)

Comments suppressed due to low confidence (1)

src/inc/startup/setup.php:5

• The documentation comment is missing an asterisk on line 4 to properly format as a multi-line comment. It should be " * This file should only..." instead of just "This file should only..."

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