feat: restructure marketplace to 8 categories with 114 apps

New categories:
- Browser Extensions (15): Chrome, Firefox, Safari, Edge, Opera, Brave
- IDE & Dev Tools (15): VS Code, JetBrains, Obsidian, Sublime, Neovim + integrations
- Android & TV (9): eRide, eSocial, eTrack, eTravel, eWallet, eOffice, EoStudio, eBrowser, eBot
- iOS & iPadOS (9): Same apps for iPhone/iPad
- Desktop (4): eOffice, EoStudio, EoSim, eBrowser with x86/ARM/Apple Silicon
- Embedded/Native (44): 40+ LVGL apps
- Cloud & Services (4): Firebase, Docker, Web, WASM
- OS & VM Images (13): EoS ISO (x64/ARM), EoSim VirtualBox/VMware/QEMU/Docker

Total: 114 apps across 8 categories

Author: srpatcha