refactor: update legacy files to maintain compatibility with bb_cfg deprecation

- Added comments in init_bb.php, Template.php, and Cron.php to indicate that bb_cfg is deprecated but retained for compatibility with non-adapted code.
- Ensured clarity in documentation for future reference while transitioning to the new configuration system.

Files modified:
- init_bb.php
- Template.php
- Cron.php

library/includes/init_bb.php

@@ -375,6 +375,7 @@ function make_url(string $path = ''): string
 require_once INC_DIR . '/functions.php';
 
 // Merge database configuration with base configuration using singleton
+// bb_cfg deprecated, but kept for compatibility with non-adapted code
 config()->merge(bb_get_config(BB_CONFIG));
 $bb_cfg = config()->all();
 

src/Legacy/Admin/Cron.php

@@ -23,6 +23,7 @@ class Cron
     public static function run_jobs(string $jobs): void
     {
         /** @noinspection PhpUnusedLocalVariableInspection */
+        // bb_cfg deprecated, but kept for compatibility with non-adapted cron jobs
         global $bb_cfg, $datastore;
 
         \define('IN_CRON', true);

src/Legacy/Template.php

@@ -17,7 +17,7 @@ class Template
 {
     /**
      * Variable that holds all the data we'll be substituting into the compiled templates.
-     * This will end up being a multi-dimensional array like this:
+     * This will end up being a multidimensional array like this:
      * $this->_tpldata[block.][iteration#][child.][iteration#][child2.][iteration#][variablename] == value
      * if it's a root-level variable, it'll be like this:
      * $this->vars[varname] == value  or  $this->_tpldata['.'][0][varname] == value
@@ -228,6 +228,7 @@ class Template
     {
         $this->cur_tpl = $filename;
 
+        /** @noinspection PhpUnusedLocalVariableInspection */
         // bb_cfg deprecated, but kept for compatibility with non-adapted themes
         global $lang, $source_lang, $bb_cfg, $user;