soheil khaledabadi e58dcd8581 fix(templates): fill pptx via direct zip/XML editing instead of PhpPresentation ...

Round-tripping real-world .pptx files through PhpPresentation's object model
was silently corrupting/losing content it doesn't fully model (themes, masters,
layouts, fonts), so placeholder replacement wasn't reliable. Now the service
edits the .pptx as a zip archive directly: only the touched slide XML text runs
and swapped image bytes change, everything else stays byte-identical to the
source file. Drops the now-unused phpoffice/phppresentation dependency.

2026-07-23 00:32:47 +03:30

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