CobbleGacha Expanded Alpha 3.7.33

Publication/default-content pass:
- Reward cards now use full English tier labels: COMMON, RARE, EPIC, ULTRA, LEGENDARY.
- Bundles 30 default banner textures directly inside the mod.
- Pokemon-art-heavy banner images are NOT bundled; those four slots use new abstract/generated-style replacements.
- Fresh installs receive the maintainer-provided current banner configuration as the default banner set (31 definitions).
- Runtime active/schedule timestamps were reset to zero in the bundled default so a fresh server does not inherit development-session state.
- Player 50/50 guarantee state is never bundled.
- CobbleGacha config files are organized under config/cobblegacha/:
    cobbleserverutils.json
    cobbleserverutils-banners.properties
    cobbleserverutils-auto-rotation.properties
    cobbleserverutils-50-50-state.properties
- Existing root-level config files are automatically moved into the new folder on startup.
- Existing user configuration wins: the bundled banner defaults are installed only when no banner config exists.
- Gacha odds/reward logic and the stable 3.7.32 Pokemon-card preview are unchanged.
