docs: add Python download link in READMEs

docs: streamline READMEs and move detailed content to docs/

fix(svg_to_pptx): fix donut stroke threshold, custom dasharray output, and feDropShadow parsing

docs: remove GitHub Sponsors button from READMEs

feat: support PPTX template sources in create-template workflow

feat(workflows): add topic-research workflow for source-less PPT generation

docs: add mandatory element grouping rules to shared-standards

feat(examples): regen kimsoong loyalty PPT to McKinsey v2 + fix gitignore

feat: add repo update helper

docs: fix gemini base url example

docs: add cost analysis FAQ to both READMEs

docs: add custom template creation guide to both READMEs

1. docs(standards): add arc path and diagonal arrow calculation rules

fix(executor): enforce speaker notes label localization to prevent mixed-language output

feat(svg_to_pptx): add rotate support to all element types and tune shadow/glow params