Installer authorization, language menu, and global satellite imagery

Reworks Search optimization into a guided, prefilled four-language administration form with English fallback guidance
Keeps the administration dashboard at three equal-width, equal-height cards per row on large screens
Adds centrally managed installation keys that bind to the first validated external domain and fail closed when authorization is unavailable
Allows key-free installation only on skymission.info and its subdomains
Adds theme-specific, brighter browser icons and a flag-based language popup before the theme control
Applies the requested homepage platform sentence in English, German, French, and Luxembourgish
Automatically optimizes the 2D/3D mapping flight-line angle whenever the survey area changes
Widens the Planner settings panel from 290 px to as much as 435 px and aligns its controls
Replaces the Luxembourg-only orthophoto with global Esri World Imagery and visible provider attribution
Moves drone-mission export to the final action at the bottom of the Planner settings panel