- Added startup_complete flag to MainWindow
- load_camera_config() now skips during initialization
- Only startup configuration sets parameters at launch
- Removed redundant parameter setting loops
- Enhanced logging for startup flow clarity

Fixes issue where parameters were being set 3-4 times during startup:
1. Camera detection -> parameters set
2. Config load -> parameters set
3. Startup config -> parameters set
4. Camera selection -> parameters set

Now only startup config writes parameters during initialization,
all other operations refresh display only until startup_complete=True