Complete Linux system optimization suite with tmpfs, zram, and German locale support

- Fixed missing setup_tmpfs() function that was causing silent failures
- Added comprehensive system scanning for browsers, IDEs, gaming caches
- Implemented detailed optimization information display for transparency
- Added German locale compatibility for 'free' command (Speicher: vs Mem:)
- Fixed division by zero errors in RAM calculations
- Created tmpfs-info.sh helper script for detailed status reporting
- Enhanced scanning to work on already-optimized systems
- Added comprehensive optimization breakdowns with purpose explanations

CHANGELOG.md

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+# Changelog
+
+## [2025-09-23] - tmpfs Setup Fix
+
+### Fixed
+- **one-button-optimizer.sh**: Fixed critical issue where tmpfs setup was not working
+  - Added missing `setup_tmpfs()` function that was referenced but not implemented
+  - Enhanced tmpfs analysis to actually scan system for cache directories 
+  - Added intelligent profile recommendation based on RAM size and existing cache data
+  - Fixed tmpfs persistence by generating proper fstab entries
+  - Updated systemd service to restore tmpfs mounts after reboot
+
+### Enhanced
+- **tmpfs Analysis**: Now scans for actual cacheable data:
+  - Browser caches (Chrome, Firefox, Chromium)
+  - Package caches (/var/cache/apt)
+  - Temporary files
+  - Shows actual cache sizes and provides intelligent recommendations
+
+### Technical Details
+- **Issue**: When users selected "yes" for tmpfs setup, nothing happened because the `setup_tmpfs` function was missing
+- **Root Cause**: The function was called in main() but never defined
+- **Solution**: Implemented complete tmpfs setup with intelligent sizing and persistence
+
+### Testing
+- Added test script (`test-tmpfs-fix.sh`) to verify functionality
+- Confirmed syntax validation passes
+- Verified tmpfs analysis logic works correctly
+
+## Previous versions
+- Initial implementation with zram, kernel tuning, and basic tmpfs detection