docs: add screenshot showcase to README + gallery
Replace the placeholder Screenshots section with a hero voice/video shot and a curated 6-shot grid (chat, screen-share controls, spaces, federated DMs, social discovery, federation admin), linking to a new docs/screenshots.md gallery of all 14 shots grouped by feature. Images are optimized to 1600px WebP (~1.2MB total vs ~45MB raw); raw originals in demo-pictures/ are gitignored.
Jannis Braun
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